fix: declare the compiled contract set in the dev release manifest

`corepack pnpm dev` did not boot. Plain `vite` serves
`public/release-manifest.json` verbatim, and that hand-maintained fixture still
declared `"packages": []` after the first real contract contribution was
registered. `verifyContractSet` runs unconditionally at boot — before any
adapter is chosen, so in the default `MOCK` mode as much as in `HTTP` — saw the
build had compiled `@tech-log/studio-contract` and failed closed with
`CONTRACT_SET_PACKAGE_MISSING`. Production builds were never affected:
`scripts/generate-build-manifest.ts` derives `dist/release-manifest.json`'s
block from the same composed set.

Editing the fixture by hand is not the fix — it had already gone stale twice,
once when the package first appeared and once when the contract moved 2.0.0 ->
3.0.0, because every regeneration changes the package digest. So
`generate:tech-log-contract` now refreshes the block itself, as its last step
and through a dynamic import so it reads the canonical source it just wrote.
`generate:dev-release-manifest` does the same refresh on its own.

The composed set can also change without the contract being regenerated — a
contribution added to or removed from `installed-contract-contributions.ts`
moves it. Tying the refresh to contract generation is therefore necessary but
not sufficient; the CI gate that follows is what closes that half.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

public/release-manifest.json

@@ -38,7 +38,15 @@
   },
   "contractSet": {
     "setAlgorithm": "CA_CONTRACT_SET_V1",
-    "setDigest": "sha256:ad6aab71fea6a9ff87cbd170b984b339965afc90d85bb57f87801c9e0c020da2",
-    "packages": []
+    "setDigest": "sha256:e0da77655f51592ece583826d5fc6b092f57dd2bf63307e45e7e77283e6bf437",
+    "packages": [
+      {
+        "packageId": "@tech-log/studio-contract",
+        "version": "2.0.0",
+        "digest": "sha256:99f54f56ea0c582eafdbdf9be5653e3384bef0a1b08bff67f3147ee0292019ea",
+        "runtimeProtocolVersion": 1,
+        "sourceRevision": "ce2e748"
+      }
+    ]
   }
 }