chore: re-vendor both contracts from the merged design package

Only the recorded source revision moves (55a9599 -> b98eaf9). The vendored
specs and the generated types are byte-identical, which is the useful part:
the envelope redefinition landed on a merge commit, not a schema change, so
nothing downstream has to move with it.

src/features/tech-log/contracts/studio/canonical-source.json

@@ -2,7 +2,7 @@
   "packageId": "@tech-log/studio-contract",
   "version": "3.0.0",
   "digest": "sha256:6cae9924403d0761f401643a022980b8e04183eea0d890c143c9fbbbbc7431e4",
-  "sourceRevision": "55a9599",
+  "sourceRevision": "b98eaf9",
   "operationIds": [
     "getStudioSession",
     "getStudioDashboard",