docs(F153): Phase F status sync — mark merged with PR refs

[bouillipx]

Summary

Phase F (trace persistence via pointer association) actually shipped via zts212653/clowder-ai#579 (merged 2026-04-28, commit `8cc6f9a1`) but the spec header was never updated. AC-F1..F7 are all `[x]` in the AC section already; only the section/header status was stale (still `（设计中）` / `Status: spec`).

Discovered while picking up next phase work — CVO asked to "finish Phase F" based on the stale header; verified Phase F is actually done.

Changes (docs-only)

• Phase F section header: `（设计中）` → `✅` + status block with:
  • Provenance: F153 Phase F: Trace persistence via pointer association zts212653/clowder-ai#592 (CLOSED, status:accepted)
  • Implementation PR: feat(telemetry): F153 Phase F — trace persistence via pointer association zts212653/clowder-ai#579 (merged 2026-04-28, commit `8cc6f9a1`)
  • Scope note clarifying AC-F8 is intentionally deferred to Phase H (waiting on real tool execution boundary spans)
• AC section header: `Phase F（...）` → `Phase F（...）✅` for parity with Phase B/C/D/E/G/I

No code, no AC changes. Source of truth: implementation already in production on both `zts/main` and `clowder-labs/main`.

Test plan

• git diff inspected — 7 insertions, 3 deletions, single file
• Verified AC-F1..F7 already marked `[x]` (no AC checkboxes flipped)
• Verified AC-F8 stays `[ ]` (declared deferred, not failing)
• Verified `hydrate-traces.ts` + `extra.tracing` in production on both repos

@codex docs-only review please — pure status sync, no semantic changes.

🤖 Generated with Claude Code

[bouillipx]

Maine Coon review: No findings.\n\nVerified the Phase F status sync against zts212653#592, implementation PR zts212653#579, merge commit 8cc6f9a, and the current AC-F1..F8 wording in docs/features/F153-observability-infra.md. The scope note is accurate: AC-F1..F7 are complete, AC-F8 remains explicitly deferred to Phase H because current tool_use spans are zero-duration markers pending real tool execution boundaries.\n\nVerification: git diff --check; pnpm check:features. Formal GitHub approve was rejected because this gh identity is treated as the PR author.\n\n[砚砚/GPT-5.5🐾]