Add RPC Post/User resolver-cache leak reproduction coverage across 100 requests

[Copilot]

This extends RPC ContextMap streaming coverage with a relational Post/User scenario (100 posts, author/publisher + likes) resolved through withRequestResolverCache. It adds a targeted repro that runs 100 requests and demonstrates cross-request cache retention under a deliberately leaky request-context wiring (users/fibers effectively retained via shared request cache scope).

• Problem coverage

  • Adds a high-cardinality relational fixture to exercise nested request-resolver caching in realistic fan-out shape (authorUserId, publisherUserId, likes[].likeUserId).
  • Drives repeated request pressure (100 calls) to surface retention behavior that would not appear in single-request checks.

• RPC test fixture expansion

  • Introduces LeakUser, LeakPost, LeakLike, and LeakProbePosts in rpc-context-map-streaming.test.ts.
  • Seeds 100 users/posts; each post references 12 user IDs (2 direct + 10 likes).

• Leaky scope repro path

  • Adds a leaky middleware layer that intentionally shares one ContextMap across requests.
  • Uses withRequestResolverCache around a batched GetLeakUser resolver to model per-request cache behavior under incorrect scope binding.

• Leak signal assertions

  • Verifies first request resolves the full relation fan-out.
  • Verifies subsequent 99 requests do not increase resolver fetch count, indicating cross-request cache reuse/retention in the leaky setup.

• Release note

  • Adds an infra changeset: .changeset/rpc-leak-repro-post-user.md.

const first = yield* client.LeakProbePosts.handler()
expect(first).toBe(LEAK_USER_COUNT * (LEAK_USER_REFS_PER_POST + LEAK_LIKES_PER_POST))

const resolverUsersAfterFirstRequest = leakStats.resolverRequestedUsers
yield* Effect.forEach(
  Array.from({ length: LEAK_REQUEST_COUNT - 1 }, () => undefined),
  () => client.LeakProbePosts.handler(),
  { discard: true }
)

expect(leakStats.resolverRequestedUsers).toBe(resolverUsersAfterFirstRequest)

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commit: d363114