feat: register the TechLog Studio contract contribution

Registers the TECH_LOG_STUDIO_SESSION SAME_ORIGIN_COOKIE auth profile and
declares the tech-log-studio-http-v1 contribution covering all 18 JSON
Studio operations (everything except the multipart uploadStudioAsset),
built from two shared builders (safeOperation/keyedOperation) so every
KEYED command gets IDEMPOTENCY_REPLAY recovery and a zero retry budget,
and every SAFE read gets a plain retry budget, without repeating the
declaration shape 18 times.

Rescopes the canonical package identity from "tech-log-studio-contract"
to "@tech-log/studio-contract" (generator, canonical-source.json,
contract-generation.test.ts) because the platform's contribution
composer requires an npm-scoped packageId; the unscoped form failed
composition. Updates the release-manifest test fixture, which hardcoded
an empty expected contract set, to derive its expected packages from the
real installed set now that TechLog is always installed.

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

tests/features/tech-log/contract-generation.test.ts

@@ -14,7 +14,7 @@ test("vendored contract matches the recorded canonical digest", () => {
 });
 
 test("canonical source records the pinned revision and version", () => {
-  assert.equal(canonicalSource.packageId, "tech-log-studio-contract");
+  assert.equal(canonicalSource.packageId, "@tech-log/studio-contract");
   assert.equal(canonicalSource.version, "2.0.0");
   // revision은 생성 시점에 기록된다. canonical 저장소는 활발히 편집 중이므로
   // 특정 값을 박아두면 계약이 그대로인데도 테스트가 깨진다. 형식만 고정한다.