docs(server): the Nest README is a blueprint again, and guides may only name paths that exist

server/src/nest/README.md drops from 988 lines to under 200: the module
shape with weather as the reference, the cross-cutting pieces, the guards,
parity and the test layout, without the bridge playbook and the services
recipe that contradicted the code. The migration log moves verbatim to
server/docs/nest-migration-history.md, marked historical.

scripts/ci/doc-paths.mjs resolves every backtick path in the CLAUDE.md files,
the root README, the blueprint and the wiki against the tracked files. The
paths already missing are listed in a baseline that only shrinks, and the
changes job runs it so docs-only changes are checked too. The wiki no longer
says the Playwright flows stay out of CI.

.github/workflows/test.yml

@@ -92,6 +92,14 @@ jobs:
       - name: Test the classifier
         run: npm run test:ci-scripts
 
+      - name: Guides only name paths that exist
+        # Every backtick path in the CLAUDE.md files, the root README, the Nest
+        # blueprint and the wiki has to resolve to a tracked file; the ones
+        # already missing are listed in scripts/ci/doc-paths-baseline.json,
+        # which only shrinks. Here rather than in a code job, so a docs-only
+        # change is checked too.
+        run: node scripts/ci/doc-paths.mjs
+
       - name: List the changed files
         id: list
         env: