git:20261004.4bb7222 to git:20261004.1dfa507

2 added, 0 removed. Audit A to A.

---

description: Immediate turn admission and autonomous retry semantics

globs:

- "internal/session/manager_turn_lock*.go"

- "internal/session/turn_busy.go"

- "internal/agent/background_notify*.go"

- "internal/serve/wake.go"

- "cmd/coddy/acp_wake*.go"

- "external/cli/background.go"

+ - "external/httpserver/composer_stream_relay.go"

+ - "external/httpserver/turn_mirror.go"

- "external/httpserver/*wake*.go"

- "external/gateway/*/wake.go"

alwaysApply: false

---

# Turn admission

- The turn lock refuses immediately and never queues.

- An autonomous caller preserves and propagates `ErrSessionTurnBusy` for retry; it is not success, permanent failure, or a consumed notification.

- Retry absorbs tasks completed while waiting and avoids starting a second turn.

- Acquire the turn before replacing live relay ownership.

- Every new autonomous path gets an end-to-end test with the real manager lock.