diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6249de341..9b8bbd9b4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -355,6 +355,14 @@ jobs:
         # unknown, passthrough, any) in shared's request schemas.
         run: cd shared && npm run contracts:open
 
+      - name: Unused code and dependencies check
+        # knip (knip.jsonc) over client, server and shared: unused files,
+        # exports, types and dependencies per file may not rise above
+        # scripts/ci/knip-baseline.json (scripts/ci/knip-ratchet.mjs). Here
+        # rather than in client-quality because it needs every workspace's
+        # dependencies, which only this job installs.
+        run: npm run lint:knip
+
   client-quality:
     name: Client Types & Lint
     needs: changes
diff --git a/CLAUDE.md b/CLAUDE.md
index 67e55294d..0a0ddcda0 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -22,6 +22,7 @@ npm run dev                       # build shared, then watch shared + server + c
 npm run build                     # build shared → server → client (order matters)
 npm run lint                      # lint all three workspaces, check-only (npm run lint:fix applies the fixes in shared and server)
 npm run format                    # prettier --write all three
+npm run lint:knip                 # knip over client/server/shared (knip.jsonc): unused files, exports, types, deps may only shrink against scripts/ci/knip-baseline.json (CI gate; --update lowers it)
 ```
 
 Tests:
@@ -133,7 +134,7 @@ These principles come out of a full-repo audit and shape all new code:
 
 ## Quality gates in CI
 
-`.github/workflows/test.yml` runs, per package: typecheck (server also `typecheck:tests`, client also the strict-mode ratchet `lint:strict`), lint (client and server through `lint:warnings`, which also holds the warning count per rule), `lint:pages`, `lint:rtl`, `lint:size` (client and server), the server's `lint:strict`, `lint:boundaries`, `lint:tx`, `lint:dialect`, `lint:test-sql`, `lint:test-mocks`, `lint:test-new-service`, `lint:query-api`, `lint:mcp-zod`, `lint:service-http` and `lint:response-contracts`, the client's and server's `lint:format`, `lint:layers`, `lint:offline`, `lint:dup`, `lint:pairs`, `lint:skips`, `lint:i18n-keys` and `theme:lint`, shared's `contracts:open`, `check:plugin-facts`, `i18n:parity:strict` (with the untranslated-strings ratchet), the S3 contract suite, the Postgres probe (`postgres-probe`: every dialect helper on SQLite and Postgres, and the statements every repository method reaches with sample arguments against a Postgres service; the SQL errors per method and the list of methods it cannot measure are held to a baseline that only shrinks and fails while it is still unmeasured; see `server/CLAUDE.md`), the browser end-to-end flows (Chromium and WebKit), a client build with `check:gl-split`, coverage for all four packages, then a SonarCloud scan. It also builds the Docker image and boots it until `/api/health/ready` answers (`docker-image`), and lints and renders the Helm chart against the Kubernetes schemas and runs `docker compose config` on every compose file (`deploy-manifests`). `lint-prettier.yml` additionally runs `lint` + `lint:format` on `shared/`, both check-only. `plugin-sdk` has no lint script and is outside the eslint gates. **Not in CI**: the screenshot and help-media Playwright projects; run them locally. There are no git hooks; nothing runs before a commit except you. Other workflows build Docker images, scan them, and publish `trek-plugin-sdk` on `plugin-sdk-v*` tags.
+`.github/workflows/test.yml` runs, per package: typecheck (server also `typecheck:tests`, client also the strict-mode ratchet `lint:strict`), lint (client and server through `lint:warnings`, which also holds the warning count per rule), `lint:pages`, `lint:rtl`, `lint:size` (client and server), the server's `lint:strict`, `lint:boundaries`, `lint:tx`, `lint:dialect`, `lint:test-sql`, `lint:test-mocks`, `lint:test-new-service`, `lint:query-api`, `lint:mcp-zod`, `lint:service-http` and `lint:response-contracts`, the client's and server's `lint:format`, `lint:layers`, `lint:offline`, `lint:dup`, `lint:pairs`, `lint:skips`, `lint:i18n-keys` and `theme:lint`, shared's `contracts:open`, the repo-wide `lint:knip` (in server-quality), `check:plugin-facts`, `i18n:parity:strict` (with the untranslated-strings ratchet), the S3 contract suite, the Postgres probe (`postgres-probe`: every dialect helper on SQLite and Postgres, and the statements every repository method reaches with sample arguments against a Postgres service; the SQL errors per method and the list of methods it cannot measure are held to a baseline that only shrinks and fails while it is still unmeasured; see `server/CLAUDE.md`), the browser end-to-end flows (Chromium and WebKit), a client build with `check:gl-split`, coverage for all four packages, then a SonarCloud scan. It also builds the Docker image and boots it until `/api/health/ready` answers (`docker-image`), and lints and renders the Helm chart against the Kubernetes schemas and runs `docker compose config` on every compose file (`deploy-manifests`). `lint-prettier.yml` additionally runs `lint` + `lint:format` on `shared/`, both check-only. `plugin-sdk` has no lint script and is outside the eslint gates. **Not in CI**: the screenshot and help-media Playwright projects; run them locally. There are no git hooks; nothing runs before a commit except you. Other workflows build Docker images, scan them, and publish `trek-plugin-sdk` on `plugin-sdk-v*` tags.
 
 - **`ci-ok` is the required check.** The branch ruleset requires `ci-ok` (plus `lint` and `check-target` from their own workflows), and `ci-ok` needs every job above except the scan. It fails if any of them failed or was cancelled and passes if they passed or were skipped. A new gate job counts only once it is listed in `ci-ok`'s `needs:`.
 - **Guides name paths that exist**: the `changes` job runs `scripts/ci/doc-paths.mjs`, which resolves every backtick path in the CLAUDE.md files, `README.md`, `server/src/nest/README.md` and the wiki against the tracked files; the missing ones are listed in `scripts/ci/doc-paths-baseline.json`, which only shrinks (`--update` after a fix).
diff --git a/knip.jsonc b/knip.jsonc
new file mode 100644
index 000000000..c79a82181
--- /dev/null
+++ b/knip.jsonc
@@ -0,0 +1,70 @@
+{
+  // knip over the three workspaces: unused files, exports, types and
+  // dependencies. scripts/ci/knip-ratchet.mjs (npm run lint:knip) holds what it
+  // finds today in scripts/ci/knip-baseline.json and fails on anything new.
+  // A false positive is fixed here, with the reason, never in the baseline.
+  "$schema": "https://unpkg.com/knip@6/schema.json",
+  // plugin-sdk is published on its own with its own lockfile and is not a
+  // root workspace; its test files would otherwise read as unlisted vitest.
+  "ignore": ["plugin-sdk/**"],
+  // test.yml runs `cd server && node --require tsconfig-paths/register`; knip
+  // resolves the workflow from the root, where server's dependency is not.
+  "ignoreUnresolved": ["tsconfig-paths/register"],
+  "workspaces": {
+    ".": {
+      "entry": ["scripts/ci/*.mjs", "scripts/*.{cjs,mts}"],
+      "project": ["scripts/**/*.{mjs,cjs,mts}"],
+      // An optional peer of tsdown, which loads shared/tsdown.config.ts through
+      // it; nothing imports it by name.
+      "ignoreDependencies": ["unrun"]
+    },
+    "client": {
+      // The app, its scripts, the Playwright specs and the server launcher
+      // playwright.config.ts starts (`node e2e/server-launch.mjs`), and the tests.
+      "entry": [
+        "src/main.tsx",
+        "scripts/*.mjs",
+        "e2e/**/*.{ts,mjs}",
+        "src/**/*.test.{ts,tsx}",
+        "tests/**/*.{ts,tsx}"
+      ],
+      "project": ["src/**/*.{ts,tsx}", "scripts/**/*.mjs", "tests/**/*.{ts,tsx}", "e2e/**/*.{ts,mjs}"]
+    },
+    "server": {
+      "entry": [
+        "src/index.ts",
+        "src/bootstrap.ts",
+        // Read by the MikroORM CLI and at boot, by path.
+        "src/mikro-orm.config.ts",
+        // Started with child_process.fork() by the plugin supervisor (nest/plugins/paths.ts).
+        "src/nest/plugins/runtime/plugin-host-entry.ts",
+        // The plugin-author-facing API the forked child exposes; its exported
+        // types are the contract for plugin code outside this repository.
+        "src/nest/plugins/runtime/plugin-sdk.ts",
+        // Found by the migrator and the seeder through a glob, never imported.
+        "src/db/migrations/*.ts",
+        "src/db/seeders/*.ts",
+        "scripts/**/*.{mjs,cjs,ts}",
+        "reset-admin.js",
+        "tests/**/*.ts"
+      ],
+      "project": ["src/**/*.ts", "scripts/**/*.{mjs,cjs,ts}", "tests/**/*.ts"],
+      // The MikroORM command line (npx mikro-orm), configured by the
+      // "mikro-orm" block in server/package.json and never imported.
+      "ignoreDependencies": ["@mikro-orm/cli"]
+    },
+    "shared": {
+      "entry": [
+        // The package entry points tsdown builds, one per locale for the lazy chunks.
+        "src/index.ts",
+        "src/roadtrip/planning.ts",
+        "src/i18n/index.ts",
+        "src/i18n/*/index.ts",
+        // open-request-schemas.d.mts types the .mjs script beside it.
+        "scripts/*.{mjs,d.mts}",
+        "src/**/*.spec.ts"
+      ],
+      "project": ["src/**/*.ts", "scripts/**/*.{mjs,mts}"]
+    }
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index c7c414a27..e84b24115 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,6 +14,7 @@
       ],
       "devDependencies": {
         "concurrently": "^10.0.4",
+        "knip": "^6.38.0",
         "unrun": "^0.3.1"
       },
       "engines": {
@@ -5612,22 +5613,25 @@
       }
     },
     "node_modules/@napi-rs/wasm-runtime": {
-      "version": "1.1.5",
-      "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.1.5.tgz",
-      "integrity": "sha512-AWPoBRJ9tsnVhor4sjO7rkni+7p+2IAEFj6cx06UgP10jkQHqay/36uRV/bFkgrh18D9vb4cr8Q0Pthskgzy+Q==",
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.2.5.tgz",
+      "integrity": "sha512-HshSvXzmBxNzqejd3k/KemgQ3hdREUYFRRrgxOZ+gPljDIsO2SDZrVZMd4Z/HsxudQbE62OVyVFE8z9BCurfjA==",
       "dev": true,
       "license": "MIT",
       "optional": true,
       "dependencies": {
-        "@tybys/wasm-util": "^0.10.2"
+        "@tybys/wasm-util": "^0.10.3"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=23.5.0"
       },
       "funding": {
         "type": "github",
         "url": "https://github.com/sponsors/Brooooooklyn"
       },
       "peerDependencies": {
-        "@emnapi/core": "^1.7.1",
-        "@emnapi/runtime": "^1.7.1"
+        "@emnapi/core": "^1.7.1 || ^2.0.0-alpha.4",
+        "@emnapi/runtime": "^1.7.1 || ^2.0.0-alpha.4"
       }
     },
     "node_modules/@nestjs/common": {
@@ -6336,6 +6340,329 @@
         "@otplib/plugin-thirty-two": "^12.0.1"
       }
     },
+    "node_modules/@oxc-parser/binding-android-arm-eabi": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-android-arm-eabi/-/binding-android-arm-eabi-0.150.0.tgz",
+      "integrity": "sha512-oQef2Zu4Prz1KLKznz3HqZzU9uVoA5PMoDZuuLmqms7hKmKSAPzlaMnLllJq3t+rgKmfJJ2siPrpZfFrW06btw==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-android-arm64": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-android-arm64/-/binding-android-arm64-0.150.0.tgz",
+      "integrity": "sha512-B6ofpoFiAUwIZ0MJ2IgHPvZK8FAtL4qzSZRwOkAKIfxEobE1mQC8nDdiFZj7pUaJiVUVCsfkMsBJKedzO8rZvA==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-darwin-arm64": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-darwin-arm64/-/binding-darwin-arm64-0.150.0.tgz",
+      "integrity": "sha512-J+9IHKzx/bSz1JetOfD4zKXSK9sOm4/a7+0qomJODcTL6JsRXGeV/ZdkAPSIDydfFmWzYCraMlQEosSZEyBYkQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-darwin-x64": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-darwin-x64/-/binding-darwin-x64-0.150.0.tgz",
+      "integrity": "sha512-v6IPfcAcSYrBWXV5Tce1DmxDMXLhEYpIIWiRFPJopgCVscZdLaV4MRQOUxvL3usQlw+yrwYOjBFB9IwBx+jUiQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-freebsd-x64": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-freebsd-x64/-/binding-freebsd-x64-0.150.0.tgz",
+      "integrity": "sha512-AoR/4jD02HET0KO0yNT4nbTE+XJUxiO9jB1X/ycEjUE3WrIJ3IjV/Vf+gskhWLcqqeXfvNnkDtBR7epllAm88A==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-arm-gnueabihf": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-0.150.0.tgz",
+      "integrity": "sha512-A/hycCFjLUrCmLoL5O/vBp40ohlaXO1Ta3v5hqYZxicYFs129wZmgZJggcW4mYGYbZebQLhup+N8JjeQl8qwyw==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-arm-musleabihf": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-arm-musleabihf/-/binding-linux-arm-musleabihf-0.150.0.tgz",
+      "integrity": "sha512-pbqahg1Pkz7J4RKmXm30s/iQu99hv64ayXCu8P4p75HcEH5azOdR4eGqiB6lFGkFR3mMpzaYsSKLkS8oJbjmeQ==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-arm64-gnu": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-0.150.0.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-arm64-musl": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-arm64-musl/-/binding-linux-arm64-musl-0.150.0.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-ppc64-gnu": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-0.150.0.tgz",
+      "integrity": "sha512-tEFg39mw/rHO5n8GK2DR4ZMFfsPQZtnQIPbsIpjoQRomJc/2tRfsCSmCT6gNit+NZGoeJG5aH9ATDH5bf0WnoQ==",
+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-riscv64-gnu": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-riscv64-gnu/-/binding-linux-riscv64-gnu-0.150.0.tgz",
+      "integrity": "sha512-0JO7IFkoek6HqV589Menx3hJySNXi6quRhO4tq2P7kpEHKEXoDATnoPVUpn5B7gDH2KLkdo751N0uIrGJFCTCw==",
+      "cpu": [
+        "riscv64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-riscv64-musl": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-riscv64-musl/-/binding-linux-riscv64-musl-0.150.0.tgz",
+      "integrity": "sha512-7XPzREnyAS5wHU9aB+49Uaqgoo1gVCklHc3DRlc3fJy2tXD/eAJFN1QFz/crj+Ulup5P1+axNREF+/RGaB/IRA==",
+      "cpu": [
+        "riscv64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-s390x-gnu": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-s390x-gnu/-/binding-linux-s390x-gnu-0.150.0.tgz",
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+      "cpu": [
+        "s390x"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-x64-gnu": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-x64-gnu/-/binding-linux-x64-gnu-0.150.0.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-x64-musl": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-x64-musl/-/binding-linux-x64-musl-0.150.0.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-openharmony-arm64": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-openharmony-arm64/-/binding-openharmony-arm64-0.150.0.tgz",
+      "integrity": "sha512-ZtoxX5rez36ZWkwtiEhjkCPnlTPoQ2I7lIL0IYZ1yjxMYohbvoOjBmUIZzrf9W/HouONq0omIfTeCWEY+R380w==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openharmony"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
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+      ],
+      "peer": true
     },
     "node_modules/@rollup/rollup-win32-x64-msvc": {
       "version": "4.62.0",
@@ -7346,7 +7989,8 @@
       "optional": true,
       "os": [
         "win32"
-      ]
+      ],
+      "peer": true
     },
     "node_modules/@scarf/scarf": {
       "version": "1.4.0",
@@ -7923,9 +8567,9 @@
       }
     },
     "node_modules/@tybys/wasm-util": {
-      "version": "0.10.2",
-      "resolved": "https://registry.npmjs.org/@tybys/wasm-util/-/wasm-util-0.10.2.tgz",
-      "integrity": "sha512-RoBvJ2X0wuKlWFIjrwffGw1IqZHKQqzIchKaadZZfnNpsAYp2mM0h36JtPCjNDAHGgYez/15uMBpfGwchhiMgg==",
+      "version": "0.10.4",
+      "resolved": "https://registry.npmjs.org/@tybys/wasm-util/-/wasm-util-0.10.4.tgz",
+      "integrity": "sha512-W3c4gRigFS0T/Ma4qIYF3GDAc5AQdHb1yL5znJT1Zv1YaD9Kitx656wBjvr19qbiosmZT8lWDM5BEMynUqX65A==",
       "dev": true,
       "license": "MIT",
       "optional": true,
@@ -12108,6 +12752,16 @@
         "reusify": "^1.0.4"
       }
     },
+    "node_modules/fd-package-json": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/fd-package-json/-/fd-package-json-2.0.0.tgz",
+      "integrity": "sha512-jKmm9YtsNXN789RS/0mSzOC1NUq9mkVd65vbSSVsKdjGvYXBuE4oWe2QOEoFeRmJg+lPuZxpmrfFclNhoRMneQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "walk-up-path": "^4.0.0"
+      }
+    },
     "node_modules/file-entry-cache": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-8.0.0.tgz",
@@ -12327,6 +12981,23 @@
         "node": ">= 6"
       }
     },
+    "node_modules/formatly": {
+      "version": "0.7.1",
+      "resolved": "https://registry.npmjs.org/formatly/-/formatly-0.7.1.tgz",
+      "integrity": "sha512-ESuCEJE0SGgabl9q+zABI8LhJDmF+8nhpuqDzuM48HfJ9QTD5o6PqFJDFZY7w6f8xsh5lixuj5nJsQNvYOWvKQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fd-package-json": "^2.0.0",
+        "package-manager-detector": "^1.8.0"
+      },
+      "bin": {
+        "formatly": "bin/index.mjs"
+      },
+      "engines": {
+        "node": ">=18.3.0"
+      }
+    },
     "node_modules/formidable": {
       "version": "3.5.4",
       "resolved": "https://registry.npmjs.org/formidable/-/formidable-3.5.4.tgz",
@@ -12558,6 +13229,19 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/get-tsconfig": {
+      "version": "4.14.3",
+      "resolved": "https://registry.npmjs.org/get-tsconfig/-/get-tsconfig-4.14.3.tgz",
+      "integrity": "sha512-++QEw4DIY7WGoukz+/+A/8dGYPT9l9yIadnmSgZ8Rjr3YVSVDipQSO9CdnJo9ePqFqUUqh+wk9uIaoiAwsiPkA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "resolve-pkg-maps": "^1.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/privatenumber/get-tsconfig?sponsor=1"
+      }
+    },
     "node_modules/gifwrap": {
       "version": "0.10.1",
       "resolved": "https://registry.npmjs.org/gifwrap/-/gifwrap-0.10.1.tgz",
@@ -14275,6 +14959,86 @@
         "json-buffer": "3.0.1"
       }
     },
+    "node_modules/knip": {
+      "version": "6.38.0",
+      "resolved": "https://registry.npmjs.org/knip/-/knip-6.38.0.tgz",
+      "integrity": "sha512-umytiMCaZf02MV9SOO1FEDgbDf6h20VZk3ruJE0kh52kkGjYZFRUAXHJWYoLhvhoHGINO/7GXVJmQ2vxTBvl6A==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/webpro"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/knip"
+        }
+      ],
+      "license": "ISC",
+      "dependencies": {
+        "fdir": "^6.5.0",
+        "formatly": "^0.7.0",
+        "get-tsconfig": "4.14.3",
+        "jiti": "^2.7.0",
+        "oxc-parser": "^0.150.0",
+        "oxc-resolver": "11.24.2",
+        "picomatch": "^4.0.7",
+        "smol-toml": "^1.8.0",
+        "strip-json-comments": "5.0.3",
+        "tinyglobby": "^0.2.17",
+        "unbash": "^4.0.11",
+        "yaml": "^2.9.1",
+        "zod": "^4.4.3"
+      },
+      "bin": {
+        "knip": "bin/knip.js",
+        "knip-bun": "bin/knip-bun.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/knip/node_modules/fdir": {
+      "version": "6.5.0",
+      "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
+      "integrity": "sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "peerDependencies": {
+        "picomatch": "^3 || ^4"
+      },
+      "peerDependenciesMeta": {
+        "picomatch": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/knip/node_modules/jiti": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/jiti/-/jiti-2.7.0.tgz",
+      "integrity": "sha512-AC/7JofJvZGrrneWNaEnJeOLUx+JlGt7tNa0wZiRPT4MY1wmfKjt2+6O2p2uz2+skll8OZZmJMNqeke7kKbNgQ==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "jiti": "lib/jiti-cli.mjs"
+      }
+    },
+    "node_modules/knip/node_modules/picomatch": {
+      "version": "4.0.7",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.7.tgz",
+      "integrity": "sha512-qcJu88Q2IWqJsDD529JKMdwGm/dvInW4HvQnRwiH9JtihJvzGOscDtHE3x1pBKeUOTysQ8kVmLnJ2kJu7yhcGA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jonschlinkert"
+      }
+    },
     "node_modules/kysely": {
       "version": "0.29.6",
       "resolved": "https://registry.npmjs.org/kysely/-/kysely-0.29.6.tgz",
@@ -16464,6 +17228,84 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/oxc-parser": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/oxc-parser/-/oxc-parser-0.150.0.tgz",
+      "integrity": "sha512-zwajKw1GUa57IOdafIS7/yOObGF2NihwIfZfs5yJTRprMSkiwhWOc/k+n8bwnUPbHr2/XsjfBO8KyTPaW3VpWg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@oxc-project/types": "^0.150.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/oxc-project"
+      },
+      "optionalDependencies": {
+        "@oxc-parser/binding-android-arm-eabi": "0.150.0",
+        "@oxc-parser/binding-android-arm64": "0.150.0",
+        "@oxc-parser/binding-darwin-arm64": "0.150.0",
+        "@oxc-parser/binding-darwin-x64": "0.150.0",
+        "@oxc-parser/binding-freebsd-x64": "0.150.0",
+        "@oxc-parser/binding-linux-arm-gnueabihf": "0.150.0",
+        "@oxc-parser/binding-linux-arm-musleabihf": "0.150.0",
+        "@oxc-parser/binding-linux-arm64-gnu": "0.150.0",
+        "@oxc-parser/binding-linux-arm64-musl": "0.150.0",
+        "@oxc-parser/binding-linux-ppc64-gnu": "0.150.0",
+        "@oxc-parser/binding-linux-riscv64-gnu": "0.150.0",
+        "@oxc-parser/binding-linux-riscv64-musl": "0.150.0",
+        "@oxc-parser/binding-linux-s390x-gnu": "0.150.0",
+        "@oxc-parser/binding-linux-x64-gnu": "0.150.0",
+        "@oxc-parser/binding-linux-x64-musl": "0.150.0",
+        "@oxc-parser/binding-openharmony-arm64": "0.150.0",
+        "@oxc-parser/binding-win32-arm64-msvc": "0.150.0",
+        "@oxc-parser/binding-win32-ia32-msvc": "0.150.0",
+        "@oxc-parser/binding-win32-x64-msvc": "0.150.0"
+      }
+    },
+    "node_modules/oxc-parser/node_modules/@oxc-project/types": {
+      "version": "0.150.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.150.0.tgz",
+      "integrity": "sha512-rDS5/31E9HfPl/CIzGrn0DOlvBbXFseQ5URJ9sYMfstbKLD/c6Gm9vmRzRGDdAXyOIL4zmO37lc9RIwYqVruZw==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/oxc-project"
+      }
+    },
+    "node_modules/oxc-resolver": {
+      "version": "11.24.2",
+      "resolved": "https://registry.npmjs.org/oxc-resolver/-/oxc-resolver-11.24.2.tgz",
+      "integrity": "sha512-FY91FiDBj7ls5MsFS9jN3tjz2o0/zsdSsymlakySaBwVJZorHhkWyICLZMKxlu1R9vYo+sd3z1jwb4J8x7bNDw==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      },
+      "optionalDependencies": {
+        "@oxc-resolver/binding-android-arm-eabi": "11.24.2",
+        "@oxc-resolver/binding-android-arm64": "11.24.2",
+        "@oxc-resolver/binding-darwin-arm64": "11.24.2",
+        "@oxc-resolver/binding-darwin-x64": "11.24.2",
+        "@oxc-resolver/binding-freebsd-x64": "11.24.2",
+        "@oxc-resolver/binding-linux-arm-gnueabihf": "11.24.2",
+        "@oxc-resolver/binding-linux-arm-musleabihf": "11.24.2",
+        "@oxc-resolver/binding-linux-arm64-gnu": "11.24.2",
+        "@oxc-resolver/binding-linux-arm64-musl": "11.24.2",
+        "@oxc-resolver/binding-linux-ppc64-gnu": "11.24.2",
+        "@oxc-resolver/binding-linux-riscv64-gnu": "11.24.2",
+        "@oxc-resolver/binding-linux-riscv64-musl": "11.24.2",
+        "@oxc-resolver/binding-linux-s390x-gnu": "11.24.2",
+        "@oxc-resolver/binding-linux-x64-gnu": "11.24.2",
+        "@oxc-resolver/binding-linux-x64-musl": "11.24.2",
+        "@oxc-resolver/binding-openharmony-arm64": "11.24.2",
+        "@oxc-resolver/binding-wasm32-wasi": "11.24.2",
+        "@oxc-resolver/binding-win32-arm64-msvc": "11.24.2",
+        "@oxc-resolver/binding-win32-x64-msvc": "11.24.2"
+      }
+    },
     "node_modules/p-limit": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-3.1.0.tgz",
@@ -16512,6 +17354,13 @@
       "dev": true,
       "license": "BlueOak-1.0.0"
     },
+    "node_modules/package-manager-detector": {
+      "version": "1.9.0",
+      "resolved": "https://registry.npmjs.org/package-manager-detector/-/package-manager-detector-1.9.0.tgz",
+      "integrity": "sha512-zAMfbta9nPA8AKkA4WdmNAT8R8s6Dk0/xwPsqNnRidMFcLo1YkLuPDTgs2f64XdzS8vbLNnoJ+uUIkgbz7oRHA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/pako": {
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/pako/-/pako-1.0.11.tgz",
@@ -19022,6 +19871,19 @@
         "node": ">=20.0.0"
       }
     },
+    "node_modules/smol-toml": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/smol-toml/-/smol-toml-1.9.1.tgz",
+      "integrity": "sha512-j7WyPdf0CJoutMzMoPLF/bVXHtKZIT9Rb4eGeEbWw8X2t5oirjPgpL+OpaENZrILYaXqYwnVH+qgUwVbl+pUJQ==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/cyyynthia"
+      }
+    },
     "node_modules/source-map": {
       "version": "0.8.0",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.8.0.tgz",
@@ -19344,6 +20206,19 @@
         "node": ">=8"
       }
     },
+    "node_modules/strip-json-comments": {
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-5.0.3.tgz",
+      "integrity": "sha512-1tB5mhVo7U+ETBKNf92xT4hrQa3pm0MZ0PQvuDnWgAAGHDsfp4lPSpiS6psrSiet87wyGPh9ft6wmhOMQ0hDiw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/strnum": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.4.2.tgz",
@@ -20177,6 +21052,16 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/unbash": {
+      "version": "4.0.12",
+      "resolved": "https://registry.npmjs.org/unbash/-/unbash-4.0.12.tgz",
+      "integrity": "sha512-PnKvRX+Fbxl/usVlTr/31tXIOVAH+8OdC9qaxUQcvurwEnoc3Vk/ipi2Ce8IjMxzK9byfSGdsUBjqqJGc1o5lw==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/unbox-primitive": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.1.0.tgz",
@@ -21189,6 +22074,16 @@
         "node": ">=18"
       }
     },
+    "node_modules/walk-up-path": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/walk-up-path/-/walk-up-path-4.0.0.tgz",
+      "integrity": "sha512-3hu+tD8YzSLGuFYtPRb48vdhKMi0KQV5sn+uWr8+7dMEq/2G/dtLrdDinkLjqq5TIbIBjYJ4Ax/n3YiaW7QM8A==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
     "node_modules/webidl-conversions": {
       "version": "8.0.1",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-8.0.1.tgz",
@@ -21811,6 +22706,22 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/yaml": {
+      "version": "2.9.1",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.9.1.tgz",
+      "integrity": "sha512-3NxN8+78OdzbT7C/WjGsyfPAtJaN3FNDsWxv7Y7mcDsT/oOmgW8BpyQQFFBnvZE3j9Y2Sdz1ULFLezL7Eb2yFw==",
+      "dev": true,
+      "license": "ISC",
+      "bin": {
+        "yaml": "bin.mjs"
+      },
+      "engines": {
+        "node": ">= 14.6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/eemeli"
+      }
+    },
     "node_modules/yargs": {
       "version": "18.0.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-18.0.0.tgz",
diff --git a/package.json b/package.json
index 048e4ab46..e7d391275 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
     "test:e2e": "npm run test:e2e --workspace=server",
     "test:ci-scripts": "node --test scripts/ci/*.test.mjs",
     "test:lib-scripts": "node --test scripts/lib/*.test.mjs",
+    "lint:knip": "node scripts/ci/knip-ratchet.mjs",
     "lint": "npm run lint --workspace=shared && npm run lint --workspace=server && npm run lint --workspace=client",
     "lint:fix": "npm run lint:fix --workspace=shared && npm run lint:fix --workspace=server",
     "format": "npm run format --workspace=shared && npm run format --workspace=server && npm run format --workspace=client",
@@ -32,6 +33,7 @@
   },
   "devDependencies": {
     "concurrently": "^10.0.4",
+    "knip": "^6.38.0",
     "unrun": "^0.3.1"
   },
   "comment:scarfSettings": "swagger-ui-dist ships @scarf/scarf install-time analytics; TREK sends no telemetry, so it stays off.",
diff --git a/scripts/ci/changed-areas.mjs b/scripts/ci/changed-areas.mjs
index 0b7858f41..386ebea96 100644
--- a/scripts/ci/changed-areas.mjs
+++ b/scripts/ci/changed-areas.mjs
@@ -49,6 +49,8 @@ export const AREAS = {
     'package-lock.json',
     '.nvmrc',
     'sonar-project.properties',
+    // lint:knip in server-quality reads it.
+    'knip.jsonc',
     'Dockerfile',
     ...READ_BY_TESTS,
     ...ALWAYS,
diff --git a/scripts/ci/changed-areas.test.mjs b/scripts/ci/changed-areas.test.mjs
index 6d1d2ce08..48f6f66d2 100644
--- a/scripts/ci/changed-areas.test.mjs
+++ b/scripts/ci/changed-areas.test.mjs
@@ -52,6 +52,10 @@ describe('classify', () => {
     assert.deepEqual(classify(['scripts/lib/ratchet.mjs']), { code: true, image: false, deploy: false });
   });
 
+  it('runs the tests but not the image for a knip config change', () => {
+    assert.deepEqual(classify(['knip.jsonc']), { code: true, image: false, deploy: false });
+  });
+
   it('runs the image but not the tests for a .dockerignore change', () => {
     assert.deepEqual(classify(['.dockerignore']), { code: false, image: true, deploy: false });
   });
diff --git a/scripts/ci/knip-baseline.json b/scripts/ci/knip-baseline.json
new file mode 100644
index 000000000..a9e2ab069
--- /dev/null
+++ b/scripts/ci/knip-baseline.json
@@ -0,0 +1,249 @@
+{
+  "devDependencies": {
+    "server/package.json": 3
+  },
+  "duplicates": {
+    "client/src/api/client.ts": 1,
+    "client/src/components/Map/VectorBasemap.tsx": 1,
+    "client/src/components/shared/Skeleton.tsx": 1,
+    "client/src/components/shared/SlidingTabs.tsx": 1,
+    "client/src/components/shared/Toast.tsx": 1,
+    "client/src/components/shared/Tooltip.tsx": 1,
+    "shared/src/docsync/docsync.schema.ts": 1,
+    "shared/src/tours/tours.schema.ts": 1
+  },
+  "exports": {
+    "client/scripts/lib/dup.mjs": 6,
+    "client/scripts/lib/eslint-warnings.mjs": 1,
+    "client/scripts/lib/format.mjs": 3,
+    "client/scripts/lib/offline.mjs": 1,
+    "client/scripts/lib/pairs.mjs": 1,
+    "client/scripts/lib/rtl.mjs": 2,
+    "client/scripts/lib/size.mjs": 3,
+    "client/scripts/lib/skips.mjs": 2,
+    "client/scripts/lib/strict.mjs": 1,
+    "client/scripts/lib/theme.mjs": 4,
+    "client/src/api/pluginPois.ts": 1,
+    "client/src/components/Admin/storage/storageModel.ts": 1,
+    "client/src/components/Admin/storage/useStorageAdmin.ts": 1,
+    "client/src/components/Budget/BudgetPanel.constants.ts": 1,
+    "client/src/components/Budget/BudgetPanel.helpers.ts": 5,
+    "client/src/components/Collab/useChatImages.ts": 2,
+    "client/src/components/Files/docsync/useConnectForm.ts": 2,
+    "client/src/components/Journey/journeyPhotoLayer.ts": 1,
+    "client/src/components/Journey/moodConfig.ts": 1,
+    "client/src/components/Journey/photoZoom.ts": 2,
+    "client/src/components/Layout/navItems.ts": 1,
+    "client/src/components/Map/MapViewGL.tsx": 1,
+    "client/src/components/Map/glProviders.ts": 2,
+    "client/src/components/Map/poiClusters.ts": 2,
+    "client/src/components/Packing/packingListPanel.helpers.ts": 1,
+    "client/src/components/Planner/DayPlanSidebar.constants.ts": 2,
+    "client/src/components/Planner/PlaceFormModal.helpers.ts": 1,
+    "client/src/components/Planner/transportEndpoints.ts": 1,
+    "client/src/components/Roadtrip/corridor.ts": 2,
+    "client/src/components/Roadtrip/dayWindow.ts": 1,
+    "client/src/components/Roadtrip/followTrack.ts": 1,
+    "client/src/components/Roadtrip/roadtripModel.ts": 6,
+    "client/src/components/Roadtrip/stopKinds.ts": 1,
+    "client/src/components/Roadtrip/useFollowTrack.ts": 2,
+    "client/src/components/Roadtrip/useHotelBookends.ts": 1,
+    "client/src/components/Studio/countryShapes.ts": 1,
+    "client/src/components/Tours/planner/useTourPlanner.ts": 3,
+    "client/src/components/shared/ErrorBoundary.tsx": 1,
+    "client/src/components/shared/Toast.tsx": 1,
+    "client/src/constants/mapDefaults.ts": 4,
+    "client/src/help/registry.ts": 1,
+    "client/src/i18n/supportedLanguages.ts": 1,
+    "client/src/mobile/screens/trip/roadtrip/useMRoadtrip.ts": 2,
+    "client/src/pages/dashboard/useTripSearch.ts": 1,
+    "client/src/pages/journeyDetail/JourneyDetailPage.helpers.ts": 3,
+    "client/src/pages/journeyStudio/useJourneyStudio.ts": 2,
+    "client/src/pages/sharedTrip/SharedPlaceDetails.tsx": 1,
+    "client/src/push/webPush.ts": 2,
+    "client/src/repo/docSyncRepo.ts": 1,
+    "client/src/utils/dayImpactLines.ts": 1,
+    "client/src/utils/dayMerge.ts": 1,
+    "client/src/utils/flightLegs.ts": 3,
+    "client/src/utils/formatters.ts": 1,
+    "client/src/utils/geo.ts": 1,
+    "client/src/utils/placeSource.ts": 1,
+    "client/src/utils/placesSession.ts": 1,
+    "client/src/vacay/yearWindow.ts": 1,
+    "server/src/app-config/boot-derive.ts": 1,
+    "server/src/app-config/derive.ts": 2,
+    "server/src/app-config/index.ts": 24,
+    "server/src/app-config/parsers.ts": 1,
+    "server/src/db/dialect/platform.ts": 1,
+    "server/src/mcp/index.ts": 2,
+    "server/src/mcp/nest-mcp-policy.ts": 1,
+    "server/src/mcp/scopes.ts": 3,
+    "server/src/mcp/tools/_shared.ts": 8,
+    "server/src/nest-mcp/index.ts": 1,
+    "server/src/nest/accommodations/night-seat.ts": 1,
+    "server/src/nest/app-config/index.ts": 6,
+    "server/src/nest/auth/auth.helpers.ts": 1,
+    "server/src/nest/auth/public.decorator.ts": 1,
+    "server/src/nest/backup/backup-archive.ts": 1,
+    "server/src/nest/backup/backup.impl.ts": 3,
+    "server/src/nest/budget/budget.service.ts": 1,
+    "server/src/nest/common/validate-managed-routes.ts": 1,
+    "server/src/nest/day-notes/day-notes.service.ts": 1,
+    "server/src/nest/doc-sync/providers/paperless.client.ts": 7,
+    "server/src/nest/doc-sync/providers/paperless.provider.ts": 1,
+    "server/src/nest/doc-sync/providers/papra.client.ts": 2,
+    "server/src/nest/doc-sync/providers/synology-drive.client.ts": 1,
+    "server/src/nest/doc-sync/providers/webdav.client.ts": 2,
+    "server/src/nest/doc-sync/providers/webdav.provider.ts": 1,
+    "server/src/nest/files/files.constants.ts": 1,
+    "server/src/nest/integrations/airtrail.mapper.ts": 1,
+    "server/src/nest/llm-parse/image-input.ts": 2,
+    "server/src/nest/llm-parse/llm-config.ts": 1,
+    "server/src/nest/llm-parse/llm-prompt.ts": 1,
+    "server/src/nest/maps/maps.service.ts": 2,
+    "server/src/nest/maps/providers/amap.provider.ts": 2,
+    "server/src/nest/maps/providers/places-provider.ts": 1,
+    "server/src/nest/notifications/channel-registry.ts": 1,
+    "server/src/nest/notifications/push/push-subscription.helpers.ts": 2,
+    "server/src/nest/notifications/transports/ntfy.service.ts": 1,
+    "server/src/nest/oauth/oauth.helpers.ts": 1,
+    "server/src/nest/place-enrichment/place-enrichment.service.ts": 1,
+    "server/src/nest/place-shadow/place-shadow.service.ts": 1,
+    "server/src/nest/places/kml-import.helpers.ts": 1,
+    "server/src/nest/places/places.helpers.ts": 1,
+    "server/src/nest/plugins/contributions/plugin-search.helpers.ts": 2,
+    "server/src/nest/plugins/host/plugin-data.service.ts": 1,
+    "server/src/nest/plugins/host/plugin-jobs.ts": 1,
+    "server/src/nest/plugins/mcp-tool-schema.ts": 5,
+    "server/src/nest/plugins/protocol/envelope.ts": 1,
+    "server/src/nest/public-api/public-api-request.ts": 2,
+    "server/src/nest/roadtrip/charging.helpers.ts": 1,
+    "server/src/nest/route-usage/route-usage.service.ts": 1,
+    "server/src/nest/share/share.service.ts": 1,
+    "server/src/nest/storage/storage-stats.service.ts": 1,
+    "server/src/nest/transit/transit-provider.ts": 2,
+    "shared/src/roadtrip/accessSpur.ts": 3
+  },
+  "types": {
+    "client/src/components/Admin/storage/BackendForm.tsx": 1,
+    "client/src/components/Admin/storage/storageModel.ts": 1,
+    "client/src/components/Admin/storage/useStorageAdmin.ts": 1,
+    "client/src/components/Budget/CostsToolbar.tsx": 1,
+    "client/src/components/Budget/costsModel.ts": 2,
+    "client/src/components/Collab/CollabChat.types.ts": 1,
+    "client/src/components/Collab/collabModel.ts": 2,
+    "client/src/components/Collections/useCollectionPlaceForm.ts": 1,
+    "client/src/components/Collections/useTripCopyPicker.ts": 1,
+    "client/src/components/Files/docsync/useDocSync.ts": 1,
+    "client/src/components/Journey/JourneyEntryCover.tsx": 1,
+    "client/src/components/Journey/JourneyMap.tsx": 2,
+    "client/src/components/Map/mapViewContract.ts": 1,
+    "client/src/components/Map/useTripRouteOverview.ts": 2,
+    "client/src/components/Planner/PlaceFormModal.tsx": 1,
+    "client/src/components/Planner/placeOpenState.ts": 1,
+    "client/src/components/Planner/transportEndpoints.ts": 1,
+    "client/src/components/Planner/useTripExport.ts": 1,
+    "client/src/components/Plugins/PluginFrame.tsx": 1,
+    "client/src/components/Roadtrip/alternativePins.ts": 1,
+    "client/src/components/Roadtrip/carrierRide.ts": 1,
+    "client/src/components/Roadtrip/corridor.ts": 2,
+    "client/src/components/Roadtrip/dayWindow.ts": 3,
+    "client/src/components/Roadtrip/followTrack.ts": 2,
+    "client/src/components/Roadtrip/manualStop.ts": 2,
+    "client/src/components/Roadtrip/nightSpill.ts": 1,
+    "client/src/components/Roadtrip/refuelSuggestion.ts": 1,
+    "client/src/components/Roadtrip/roadtripModel.ts": 4,
+    "client/src/components/Roadtrip/useFollowTrack.ts": 1,
+    "client/src/components/Roadtrip/useRoadtripRoutes.ts": 3,
+    "client/src/components/Studio/StudioCanvas.tsx": 1,
+    "client/src/components/Studio/grids.ts": 1,
+    "client/src/components/Studio/mapTiles.ts": 1,
+    "client/src/components/Studio/templates.ts": 1,
+    "client/src/components/Trips/useTripShare.ts": 3,
+    "client/src/components/shared/DialogShell.tsx": 1,
+    "client/src/components/shared/SlidingTabs.tsx": 1,
+    "client/src/components/shared/elevationProfileModel.ts": 1,
+    "client/src/db/offlineDb.ts": 1,
+    "client/src/help/defineScreen.ts": 1,
+    "client/src/help/types.ts": 1,
+    "client/src/hooks/useDawarichConnection.ts": 1,
+    "client/src/hooks/useDawarichSuggestions.ts": 1,
+    "client/src/i18n/supportedLanguages.ts": 1,
+    "client/src/mobile/components/MSegmented.tsx": 1,
+    "client/src/mobile/components/MSheet.tsx": 2,
+    "client/src/mobile/screens/collections/MCollLabelsSheet.tsx": 1,
+    "client/src/mobile/screens/journey/MJourneyCreateSheet.tsx": 1,
+    "client/src/mobile/screens/settings/MSetPickerSheet.tsx": 1,
+    "client/src/mobile/screens/settings/MSettingsUi.tsx": 1,
+    "client/src/mobile/screens/trip/MTripShell.tsx": 1,
+    "client/src/mobile/screens/trip/plan/planTimelineModel.ts": 1,
+    "client/src/mobile/screens/trip/tabs/transportsModel.ts": 1,
+    "client/src/mobile/screens/vacay/useMVacay.ts": 1,
+    "client/src/pages/dashboard/dashboardModel.ts": 2,
+    "client/src/pages/journeyPublic/journeyPublicModel.ts": 1,
+    "client/src/pages/tripPlanner/plannerTypes.ts": 1,
+    "client/src/pages/tripPlanner/useBookingEdits.ts": 1,
+    "client/src/pages/tripPlanner/useDayPlanEdits.ts": 1,
+    "client/src/pages/tripPlanner/usePlaceFormOpeners.ts": 1,
+    "client/src/pages/tripPlanner/useRoadtripAlternatives.ts": 1,
+    "client/src/pages/tripPlanner/useRoadtripStopEdits.ts": 1,
+    "client/src/push/webPush.ts": 1,
+    "client/src/store/backgroundTasksStore.ts": 1,
+    "client/src/store/helpStore.ts": 2,
+    "client/src/theme/applyAppearance.ts": 1,
+    "client/src/types.ts": 7,
+    "client/src/utils/connectionsVisibility.ts": 1,
+    "client/src/utils/dayDeleteImpact.ts": 3,
+    "client/src/utils/journeyLifecycle.ts": 1,
+    "client/src/utils/tripRangeImpact.ts": 1,
+    "server/src/app-config/index.ts": 2,
+    "server/src/db/repositories/AuditLog.repository.ts": 1,
+    "server/src/db/repositories/BudgetSettlements.repository.ts": 1,
+    "server/src/db/repositories/DocumentProviderFields.repository.ts": 1,
+    "server/src/db/repositories/GoogleApiUsage.repository.ts": 1,
+    "server/src/db/repositories/McpTokens.repository.ts": 1,
+    "server/src/db/repositories/PasswordResetTokens.repository.ts": 1,
+    "server/src/db/repositories/Places.repository.ts": 1,
+    "server/src/db/repositories/UserSessions.repository.ts": 1,
+    "server/src/db/repositories/_shared/rows.ts": 1,
+    "server/src/mcp/nest-mcp-policy.ts": 1,
+    "server/src/nest-mcp/index.ts": 13,
+    "server/src/nest-mcp/types.ts": 4,
+    "server/src/nest/booking-import/kitinerary.types.ts": 6,
+    "server/src/nest/collab/collab.service.ts": 1,
+    "server/src/nest/files/files.service.ts": 1,
+    "server/src/nest/integrations/airtrail.mapper.ts": 1,
+    "server/src/nest/llm-parse/llm-config.ts": 1,
+    "server/src/nest/maps/maps.helpers.ts": 2,
+    "server/src/nest/maps/providers/places-provider.ts": 1,
+    "server/src/nest/maps/trek-places.client.ts": 1,
+    "server/src/nest/memories/memories.helpers.ts": 1,
+    "server/src/nest/notifications/notifications.service.ts": 1,
+    "server/src/nest/places/places.helpers.ts": 1,
+    "server/src/nest/plugins/contributions/map-layers.controller.ts": 1,
+    "server/src/nest/plugins/host/rpc-kit/types.ts": 2,
+    "server/src/nest/plugins/install/manifest.ts": 7,
+    "server/src/nest/plugins/plugins.service.ts": 1,
+    "server/src/nest/plugins/protocol/envelope.ts": 2,
+    "server/src/nest/storage/drivers/mirror.driver.ts": 1,
+    "server/src/nest/storage/storage-registry.service.ts": 1,
+    "server/src/nest/tours/tours.helpers.ts": 1,
+    "server/src/nest/trips/trips.service.ts": 3,
+    "server/src/nest/unsplash/unsplash.service.ts": 1,
+    "server/src/nest/vacay/vacay.service.ts": 4,
+    "server/src/nest/weather/weather.impl.ts": 1,
+    "server/src/shutdown.ts": 1,
+    "server/src/systemNotices/types.ts": 7,
+    "server/src/types.ts": 14
+  },
+  "unlisted": {
+    "client/src/components/Map/MapView.tsx": 1,
+    "client/src/components/Map/hazardPopup.ts": 1,
+    "client/src/components/Map/mapZoomCeiling.test.ts": 1,
+    "client/src/components/Map/markerCluster.test.ts": 1,
+    "client/src/pages/sharedTrip/SharedMap.tsx": 1,
+    "server/tests/unit/eslint-rules/no-promise-as-value.test.ts": 1,
+    "server/tests/unit/eslint-rules/restricted-syntax-selectors.test.ts": 1,
+    "shared/src/i18n/tours-locales.spec.ts": 1
+  }
+}
diff --git a/scripts/ci/knip-ratchet.mjs b/scripts/ci/knip-ratchet.mjs
new file mode 100644
index 000000000..1c599870d
--- /dev/null
+++ b/scripts/ci/knip-ratchet.mjs
@@ -0,0 +1,27 @@
+#!/usr/bin/env node
+/*
+ * lint:knip: unused files, exports, types and dependencies may only go down.
+ *
+ * knip (configured in knip.jsonc at the repo root) follows the imports of the
+ * client, server and shared workspaces from their entry points and reports
+ * what nothing reaches: a file, an export, a type, a dependency in a
+ * package.json, an import of a package no package.json lists. Dead code
+ * costs every sweep that edits it and every reader who wonders who calls it.
+ * The findings per category and file are held in scripts/ci/knip-baseline.json:
+ * a file may not gain one, and an entry above what knip finds now, or for a
+ * file that is gone, fails until --update lowers it. A false positive (a
+ * file loaded by path, a public API surface) is fixed in knip.jsonc, with the
+ * reason, never by raising the baseline.
+ *
+ *   npm run lint:knip              check against the baseline (CI)
+ *   npm run lint:knip -- --update  lower the baseline to today's findings;
+ *                                  it never raises an entry
+ *
+ * The comparison lives in scripts/ci/lib/knip.mjs.
+ */
+import { fileURLToPath } from 'node:url';
+import { runCli } from '../../client/scripts/lib/ratchet.mjs';
+import { check } from './lib/knip.mjs';
+
+const root = fileURLToPath(new URL('../..', import.meta.url));
+await runCli('lint:knip', (args) => check({ root, update: args.includes('--update') }));
diff --git a/scripts/ci/knip-ratchet.test.mjs b/scripts/ci/knip-ratchet.test.mjs
new file mode 100644
index 000000000..3897d0a1d
--- /dev/null
+++ b/scripts/ci/knip-ratchet.test.mjs
@@ -0,0 +1,86 @@
+import assert from 'node:assert/strict';
+import { mkdtempSync, readFileSync, rmSync, writeFileSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { after, describe, it } from 'node:test';
+import { RatchetError } from '../../client/scripts/lib/ratchet.mjs';
+import { categoryCounts, check, tally } from './lib/knip.mjs';
+
+const scratch = mkdtempSync(join(tmpdir(), 'knip-ratchet-'));
+after(() => rmSync(scratch, { recursive: true, force: true }));
+
+const REPORT = {
+  issues: [
+    {
+      file: 'client/src/a.ts',
+      exports: [{ name: 'unusedA' }, { name: 'unusedB' }],
+      types: [{ name: 'OldType' }],
+      files: [],
+    },
+    { file: 'server/package.json', devDependencies: [{ name: 'nodemon' }] },
+    { file: 'client/src/dead.ts', files: [{ name: 'client/src/dead.ts' }] },
+    { file: 'client/src/toast.tsx', duplicates: [[{ name: 'useToast' }, { name: 'default' }]] },
+  ],
+};
+
+let n = 0;
+function run(baseline, report = REPORT, update = false) {
+  const path = join(scratch, `baseline-${n++}.json`);
+  writeFileSync(path, JSON.stringify(baseline));
+  const out = { log: [], error: [] };
+  const code = check({
+    root: scratch,
+    baselinePath: path,
+    update,
+    knip: () => report,
+    log: (l) => out.log.push(l),
+    error: (l) => out.error.push(l),
+  });
+  return { code, out, path };
+}
+
+const FULL = {
+  exports: { 'client/src/a.ts': 2 },
+  types: { 'client/src/a.ts': 1 },
+  devDependencies: { 'server/package.json': 1 },
+  files: { 'client/src/dead.ts': 1 },
+  duplicates: { 'client/src/toast.tsx': 1 },
+};
+
+describe('lint:knip', () => {
+  it('KNIP-001: counts each category per file with the names behind it', () => {
+    const { counts, names } = tally(REPORT);
+    assert.deepEqual(counts.exports, { 'client/src/a.ts': 2 });
+    assert.deepEqual(counts.files, { 'client/src/dead.ts': 1 });
+    assert.deepEqual(names.duplicates['client/src/toast.tsx'], ['useToast = default']);
+    assert.deepEqual(counts.dependencies, {});
+  });
+
+  it('KNIP-002: passes findings within the baseline', () => {
+    const { code, out } = run(FULL);
+    assert.equal(code, 0, out.error.join('\n'));
+    assert.match(out.log.join('\n'), /knip: 6 finding\(s\), baseline allows 6/);
+  });
+
+  it('KNIP-003: fails a new finding, by category, and names it', () => {
+    const { code, out } = run({ ...FULL, exports: { 'client/src/a.ts': 1 } });
+    assert.equal(code, 1);
+    assert.match(out.error.join('\n'), /FAIL {2}exports: client\/src\/a\.ts has 2, baseline 1: unusedA, unusedB/);
+  });
+
+  it('KNIP-004: fails an entry above its count until --update lowers it, and never raises one', () => {
+    const { code, out } = run({ ...FULL, types: { 'client/src/a.ts': 3, 'client/src/gone.ts': 1 } });
+    assert.equal(code, 1);
+    assert.match(out.error.join('\n'), /types: client\/src\/a\.ts is held at 3 in scripts\/ci\/knip-baseline\.json/);
+    const updated = run({ ...FULL, types: { 'client/src/a.ts': 3, 'client/src/gone.ts': 1 }, exports: {} }, REPORT, true);
+    const written = JSON.parse(readFileSync(updated.path, 'utf8'));
+    assert.deepEqual(written.types, { 'client/src/a.ts': 1 });
+    assert.equal(written.exports, undefined);
+  });
+
+  it('KNIP-005: a broken baseline or a report without issues stops the check', () => {
+    assert.match(categoryCounts({ nonsense: {} }), /not one of/);
+    assert.throws(() => run({ exports: { a: 0 } }), RatchetError);
+    assert.throws(() => run(FULL, { files: [] }), /no issues array/);
+  });
+});
diff --git a/scripts/ci/lib/knip.mjs b/scripts/ci/lib/knip.mjs
new file mode 100644
index 000000000..2d1c6b0bc
--- /dev/null
+++ b/scripts/ci/lib/knip.mjs
@@ -0,0 +1,163 @@
+/*
+ * The tally and the comparison behind lint:knip (scripts/ci/knip-ratchet.mjs).
+ *
+ * Built on the client's ratchet helpers, which hold the baseline rules every
+ * ratchet in the repo shares: fail closed on a broken baseline, lower only,
+ * fail on an entry above its count.
+ */
+import { spawnSync } from 'node:child_process';
+import { existsSync } from 'node:fs';
+import { join } from 'node:path';
+import {
+  countMap,
+  lowerCounts,
+  RatchetError,
+  readBaseline,
+  reportStale,
+  staleCounts,
+  writeBaseline,
+} from '../../../client/scripts/lib/ratchet.mjs';
+
+/**
+ * The kinds of finding knip reports per file, as its JSON reporter names them.
+ * Each is held apart in the baseline, so an unused export removed does not pay
+ * for an unused dependency added.
+ */
+const CATEGORIES = [
+  'files',
+  'dependencies',
+  'devDependencies',
+  'optionalPeerDependencies',
+  'unlisted',
+  'binaries',
+  'unresolved',
+  'exports',
+  'types',
+  'enumMembers',
+  'namespaceMembers',
+  'duplicates',
+  'catalog',
+];
+
+/** A baseline: each category an object of file → positive count. */
+export function categoryCounts(value) {
+  if (!value || typeof value !== 'object' || Array.isArray(value)) return 'it is not an object of category → file counts';
+  for (const [category, counts] of Object.entries(value)) {
+    if (!CATEGORIES.includes(category)) return `"${category}" is not one of ${CATEGORIES.join(', ')}`;
+    const problem = countMap(counts);
+    if (problem) return `in "${category}", ${problem}`;
+  }
+  return null;
+}
+
+const entries = (value) => (Array.isArray(value) ? value : value && typeof value === 'object' ? Object.values(value) : []);
+const nameOf = (item) =>
+  Array.isArray(item) ? item.map(nameOf).join(' = ') : typeof item === 'string' ? item : (item?.name ?? '?');
+
+/**
+ * knip's JSON report as counts per category and file, with the names behind
+ * each count. A report knip did not produce (no `issues` array) is an error of
+ * the check, not an empty result.
+ */
+export function tally(report) {
+  if (!report || !Array.isArray(report.issues)) throw new RatchetError('knip printed no issues array; see its output above');
+  const counts = Object.fromEntries(CATEGORIES.map((c) => [c, {}]));
+  const names = Object.fromEntries(CATEGORIES.map((c) => [c, {}]));
+  for (const issue of report.issues) {
+    for (const category of CATEGORIES) {
+      const found = entries(issue[category]);
+      if (!found.length) continue;
+      counts[category][issue.file] = found.length;
+      names[category][issue.file] = found.map(nameOf);
+    }
+  }
+  return { counts, names };
+}
+
+/** knip over the repository, as its parsed JSON report. */
+function runKnip(root) {
+  // knip is a root devDependency, so npm installs it at the top of node_modules.
+  const bin = join(root, 'node_modules', 'knip', 'bin', 'knip.js');
+  if (!existsSync(bin)) throw new RatchetError(`knip is not installed at ${bin}; run npm ci at the repo root`);
+  const result = spawnSync(process.execPath, [bin, '--reporter', 'json', '--no-exit-code', '--no-progress'], {
+    cwd: root,
+    encoding: 'utf8',
+    maxBuffer: 256 * 1024 * 1024,
+  });
+  if (result.error) throw new RatchetError(`knip did not run: ${result.error.message}`);
+  if (result.status !== 0) throw new RatchetError(`knip stopped with exit code ${result.status}: ${result.stderr.slice(0, 800)}`);
+  try {
+    return JSON.parse(result.stdout);
+  } catch {
+    throw new RatchetError(`knip's output is not JSON: ${result.stdout.slice(0, 300)} ${result.stderr.slice(0, 300)}`);
+  }
+}
+
+/** The baseline with each category's files in order too, so a diff of it shows only what changed. */
+const sortedFiles = (baseline) =>
+  Object.fromEntries(
+    Object.entries(baseline).map(([category, counts]) => [
+      category,
+      Object.fromEntries(Object.entries(counts).sort(([a], [b]) => (a < b ? -1 : a > b ? 1 : 0))),
+    ])
+  );
+
+const sum = (counts) => Object.values(counts).reduce((a, b) => a + b, 0);
+
+/**
+ * Runs knip (or knip, in a test) and compares its findings with the baseline
+ * at baselinePath. Returns the exit code.
+ */
+export function check({
+  root,
+  baselinePath = join(root, 'scripts/ci/knip-baseline.json'),
+  update = false,
+  knip = runKnip,
+  log = console.log,
+  error = console.error,
+}) {
+  let baseline = readBaseline(baselinePath, categoryCounts);
+  const { counts, names } = tally(knip(root));
+
+  if (update) {
+    baseline = Object.fromEntries(
+      Object.entries(baseline)
+        .map(([category, allowed]) => [category, lowerCounts(allowed, counts[category] ?? {})])
+        .filter(([, allowed]) => Object.keys(allowed).length)
+    );
+    writeBaseline(baselinePath, sortedFiles(baseline));
+  }
+
+  let grown = 0;
+  let stale = 0;
+  for (const category of CATEGORIES) {
+    const allowed = baseline[category] ?? {};
+    for (const [file, n] of Object.entries(counts[category])) {
+      if (n <= (allowed[file] ?? 0)) continue;
+      grown++;
+      error(
+        `FAIL  ${category}: ${file} has ${n}, baseline ${allowed[file] ?? 0}: ${names[category][file].slice(0, 8).join(', ')}`
+      );
+    }
+    const fallen = staleCounts(allowed, counts[category]);
+    reportStale(fallen, {
+      file: 'ci/knip-baseline.json',
+      command: 'lint:knip',
+      label: (file) => `${category}: ${file}`,
+      error,
+    });
+    stale += fallen.length;
+  }
+  if (grown) {
+    error(
+      'Delete what nothing uses, or list the dependency it needs. If knip is wrong (a file loaded by path, ' +
+        'a public API), say so in knip.jsonc with the reason; the baseline is not the place for it.'
+    );
+  }
+  const now = CATEGORIES.map((c) => sum(counts[c])).reduce((a, b) => a + b, 0);
+  const held = Object.values(baseline)
+    .map(sum)
+    .reduce((a, b) => a + b, 0);
+  log(`knip: ${now} finding(s), baseline allows ${held}`);
+  return grown || stale ? 1 : 0;
+}