PR [#17109](https://github.com/pingdotgg/t3code/pull/17109) — Claude buffered-wake takeover proof
Head verified: 7ac31eebc8194251f0924e8748c155d7fa1ce328
Original contributor head: d06173bf6a2f633de64996e52c10f76ce29afc96
Base verified: 1451e7cb23034d29774338608368a15d8845df36

Deterministic SDK frames drive real Claude adapter, session manager, orchestration and SQLite services. This is server-level behavior proof, not an authenticated live Claude CLI/model claim.

Before: all four initial behavior regressions fail on main. Contributor implementation passes 314/fails 2 of 316: provider switching after eligibility and resumed outcome persistence remain broken.
After: 492/492 across nine focused suites. Five original PR cases became four behavior regressions; eight further cases cover distinct atomic admission, queued switch/cancel/planning failure, resumed transcript, subscription closure, command-output cleanup and transcript-order behavior. Existing main tests are preserved.

Ordering regression discovered in review round2: published R2 persisted the Agent card before its introduction. Added one integration case against real stored ordinals, red on R2:
AssertionError: the introduction precedes its Agent card: expected 1000003 to be below 1000002
After narrowing live turn-item tagging: 9/9 integration cases pass; the independent Sol review also reran and passed the new regression.

Final focused suite output (implementation-r3-tests.log):
 Test Files  9 passed (9)
      Tests  492 passed (492)
   Duration  23.31s

Replay suites: 158/161 initially passed, with three timeouts under machine load. Exactly those three cases passed on unchanged-source targeted retry, 3/3. No assertion failures, timeout changes, sleeps or polling added. Do not interpret the initial combined replay run as completely green.

Four previous fixes were individually reverted to confirm their regressions fail: queued wake switch, session-owned command settlement/live-output cleanup, subscription closure/no duplicate ingest, newer resumed transcript retention.

Scoped server and provider-core typechecks, targeted lint and formatting pass. Existing warnings only. git diff --check passes.

Live smoke: isolated Linux development server starts, collaborative browser pairs and chat composer loads. The live-data snapshot was rejected due to incompatible migration history; fresh isolated state was used. No developer live data was written.

Unverified: authenticated live Claude CLI provider-switch flow; macOS, Windows, Electron desktop, iOS, Android. No merge performed. No screenshot attached because no visual component changed.