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## Why The goal extension needs a way to resume an active goal after the thread becomes idle, but the old core goal runtime should not be refactored as part of this step. The missing piece is a small core-owned turn-start primitive: let an extension ask for a normal model turn only when the thread is idle, and otherwise fail without injecting into whatever is currently active. ## What Changed - Adds `CodexThread::try_start_turn_if_idle(...)` as the narrow extension-facing primitive for synthetic idle work. - Implements the session side so it refuses to start when: - the provided input is empty, - the session is in plan mode, - a turn is already active, or - trigger-turn mailbox work is pending. - Gives trigger-turn mailbox work priority if it appears while the idle turn is being prepared. - Wires `GoalExtension::on_thread_idle` to read the active persisted goal and submit the continuation prompt through this idle-only primitive. - Keeps the legacy core goal continuation implementation in place instead of folding it into this PR. ## Behavior This is intentionally best-effort. If `try_start_turn_if_idle` observes that the thread is not idle, or that higher-priority mailbox work should run first, it returns the input to the caller. The goal extension drops that continuation prompt and waits for a future idle opportunity instead of injecting stale synthetic goal text into an active turn. ## Validation - `just test -p codex-core try_start_turn_if_idle_rejects_active_turn_without_injecting` - `just test -p codex-goal-extension`
f1b1b64005
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2026-06-01 10:42:01 +02:00
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