PR 27460 real-dev verification
Main: 8b74a69019 (github/main)
PR: a5eb0c65830d195322426a363058c2c4aa0c4768

Commands run:
git worktree add ../main github/main
vp i
vp run dev --no-seed (background, main only)
git fetch https://github.com/UtkarshUsername/t3code.git perf/skip-idle-inbox-serialization
git switch --detach a5eb0c65830d195322426a363058c2c4aa0c4768
vp i
vp run dev --no-seed --home-dir /home/user/t3code/.t3 (background, main stopped)

Browser: repository Playwright + /usr/bin/google-chrome
Project: inbox-verification, real initialized git repo, added through web UI
Data: one untouched starter thread + one thread with real Codex turns, created through web UI
Measurement: CDP conditional breakpoints at the real Sidebar tracker observation and placement serialization; PR JSON.stringify call counter filtered to threadInbox.ts. No source edits, injected thread state, mocks, or replay provider.

Main idle: 7 observations x 2 threads; 14 placement serializations (2 per observation).
PR idle: 3 observations x 2 threads; 0 placement serializations.
PR working control: 13 placement serializations during a real turn and its exit grace.
Grace begins: 2026-11-01T01:14:44.911Z
Grace deadline: 2026-11-01T01:14:46.911Z
Grace release: 2026-11-01T01:14:46.912Z
DOM: Working shelf -> completed response while still on Working shelf -> top of inbox.

Persisted provider runs, also inspected through web UI:
[
  {
    "ordinal": 1,
    "status": "completed",
    "model": "gpt-6.1-sol",
    "requestedAt": "2026-11-01T01:12:31.541Z",
    "completedAt": "2026-11-01T01:12:36.510Z"
  },
  {
    "ordinal": 2,
    "status": "completed",
    "model": "gpt-6.1-sol",
    "requestedAt": "2026-11-01T01:14:34.177Z",
    "completedAt": "2026-11-01T01:14:44.712Z"
  },
  {
    "ordinal": 3,
    "status": "completed",
    "model": "gpt-6.1-sol",
    "requestedAt": "2026-11-01T01:15:25.194Z",
    "completedAt": "2026-11-01T01:15:37.784Z"
  }
]

Neighbor checks through real web controls:
Settle -> Settled count 1; Un-settle -> inbox, Settled count 0.
Snooze for 1 hour -> Snoozed count 1, removed from inbox; Wake thread now -> inbox, no Snoozed shelf.

Blacksmith command:
vp i && vp test run packages/client-runtime/src/state/threadInbox.test.ts
Result: 1 test file passed; 22 tests passed.
Existing head CI: 30 successful, 0 failing, 0 pending.

No source changes. No commits or pushes.
Not exercised: native mobile, Electron shell, other providers, remote/relay/tunnel clients, live pending approval/input transitions, large-thread-count CPU/frame-time measurements.