- src/web/routes/session-routes.ts:2102: the guarded-submit 409 now applies to tagged input (clientId + seq) only; untagged input is held like a WebSocket frame. The raw write (:2228) goes through holdForGuardedLease and answers 200 once held (a send-and-wait reads `delivered` from the held write; a full queue releases the waiter and answers 409); a mux write takes its own turn in writeViaMux.
- test/guarded-lease-held-input.test.ts: real-Session route tests for an untagged raw POST during the lease (written after the Enter) and a held send-and-wait (delivered: true); both fail without the fix.
- test/routes/session-routes.test.ts + test/mocks/mock-session.ts: the 409 test now covers tagged input only; new tests for untagged raw (held), untagged mux (own turn) and a full hold queue (409); MockSession gains holdForGuardedLease/releaseGuardedLease and a lease-aware writeViaMux.
- src/session.ts:4787 (guardedInputHeld JSDoc) + write() + docs/architecture-invariants.md: write() refuses during the lease only, so cron's paste mode can land ahead of input still draining.
- docs/api-reference.md: the input route's 409 is for tagged input; untagged input is held.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Codeman maintainer
6368128f1e