feat(plugin-sdk): dev server, preflight, auto-PR submit, signing, wizard

Round out the author experience so the loop is create -> dev -> release/submit
without hand-work or a round-trip through registry review.

- `dev`: run a plugin locally with a real request loop and hot reload — no full
  TREK. Injects a ctx that enforces the manifest's granted permissions (an
  ungranted call throws, so you catch a missing grant), backs db:own with a real
  SQLite file (node:sqlite), serves routes under /api and page/widget UI at /ui,
  and reloads on save. Dependency-free (node:http + built-ins).
- `preflight`: run the registry CI checks locally over the network (tag->commit,
  manifest parity, artifact sha256/size, native scan, README quality gate) so a
  green run predicts a green CI.
- `submit`: fork TREK-Plugins, branch off current main, write/merge the entry,
  push, and open the PR — the last manual publishing step, automated.
- `keygen`/`sign` + `--sign` on entry/release/submit: dependency-free Ed25519
  author signatures over the artifact bytes, verified 1:1 against the server's
  TOFU check. Fills authorPublicKey + signature and guards against a key change.
- `create` gains an interactive wizard (id/type/author/permissions) and flags.
- README + Development/Publishing/Permissions wikis document the new flow.

24 tests pass (sign round-trips through a server-shaped verifier; zip reader;
scaffold options; entry signing + key-change guard).

plugin-sdk/package.json

@@ -1,6 +1,6 @@
 {
   "name": "trek-plugin-sdk",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "SDK for building TREK plugins: types, definePlugin, a mock host, manifest validation, and the create-trek-plugin / trek-plugin CLIs.",
   "type": "module",
   "license": "MIT",