docs(bf-2f5): confirm watchdog implementation is complete and verified

All requirements verified:
- No-output timeout (PTY 90s, stream-json 90s) ✓
- Max-turn timeout (overall 3600s, stop hook 120s) ✓
- SIGTERM → SIGKILL with descendants ✓
- Clear diagnostics to stderr ✓
- Temp resource teardown ✓
- Exit non-zero (124) ✓

Implementation was completed in commits:
- 7d40c93: add comprehensive watchdog timeout mechanism
- 07013f8: add self-pipe signaling
- ea162c0: correct timeout exit code from 3 to 124
- 11e9b72: document watchdog timeout implementation
- d116dae: verify watchdog timeout implementation is complete

Co-Authored-By: Claude <noreply@anthropic.com>
Bead-Id: bf-2f5

notes/bf-2f5-status-2025-06-25.md

@@ -0,0 +1,66 @@
+# Bead bf-2f5 Status Verification (2025-06-25)
+
+## Summary
+
+Bead bf-2f5 (watchdog timeout implementation) is **COMPLETE** and verified.
+
+## Implementation Status
+
+All requirements from the bead specification have been fully implemented:
+
+### ✅ 1. No-Output Timeout (90s configurable)
+- **PTY first-output**: 90s default (src/watchdog.rs:23-24)
+- **Stream-json first-output**: 90s default (src/watchdog.rs:20)
+- Configurable via `--first-output-timeout` and `--stream-json-timeout`
+
+### ✅ 2. Max-Turn Timeout
+- **Overall timeout**: 3600s default (src/watchdog.rs:27)
+- **Stop hook timeout**: 120s default (src/watchdog.rs:31)
+- Configurable via `--timeout` and `--stop-hook-timeout`
+
+### ✅ 3. Child Process Termination
+- SIGTERM sent immediately on timeout (src/watchdog.rs:288)
+- SIGKILL after 2s if child still alive (src/session.rs:410)
+- Process group cleanup via PTY fork (src/pty.rs)
+
+### ✅ 4. Clear Diagnostics
+- Timeout type descriptions (src/watchdog.rs:48-55)
+- stderr output with PID (src/session.rs:326-328)
+- Examples: "child produced no PTY output within deadline", "Stop hook did not fire within deadline"
+
+### ✅ 5. Temp Resource Teardown
+- CleanupGuard ensures temp dir removal (src/session.rs:43-48)
+- cleanup_temp_dir() called before exit (src/main.rs:31-33)
+- Verified by tests (tests/watchdog.rs:96-100)
+
+### ✅ 6. Non-Zero Exit Code
+- Exit code 124 for timeout (src/error.rs:115, src/main.rs:211)
+- Matches GNU timeout convention
+
+## Previous Verification
+
+The implementation was verified complete in commit d116dae:
+```
+docs(bf-2f5): verify watchdog timeout implementation is complete
+```
+
+All requirements were verified in `notes/bf-2f5-verification.md`.
+
+## Code Locations
+
+- **Watchdog module**: src/watchdog.rs (425 lines)
+- **Session integration**: src/session.rs:200-332
+- **Process kill**: src/session.rs:398-419
+- **Error handling**: src/error.rs:85-157
+- **Exit codes**: src/main.rs:202-212
+- **Tests**: tests/watchdog.rs
+
+## Test Coverage
+
+Integration tests verify:
+- `watchdog_silent_child_times_out_with_cleanup`: 2s timeout fires cleanly
+- `watchdog_one_second_timeout_fires_cleanly`: 1s timeout fires quickly
+
+## Conclusion
+
+No changes needed. Implementation is complete, tested, and verified.