fix(coding-agent): await post-compaction continuation

[parkerpettit9]

compact.run stops the current agent loop, compacts, then schedules a continuation. That scheduled work was not part of waitForIdle(), so ACP could return a silent end_turn before the continuation started.

Track the scheduled continuation in the session idle contract so headless clients wait for the resumed turn.

Verification:

• npm run check
• npx tsx ../../node_modules/vitest/dist/cli.js --run test/suite/acp-mode.test.ts

Note

Fix premature end_turn in ACP mode by awaiting post-compaction continuation

ACP previously returned a silent end_turn before a compaction-triggered continuation had a chance to resume the agent. AgentSession now tracks post-compaction continuation settlement via a promise, and the idle-drain loop awaits it before reporting idle. Cancelling a scheduled continuation also resolves the promise so no waiters hang indefinitely.

^{Macroscope summarized 01a590f.}

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Note

Medium Risk
Touches the session idle gate, ACP turn boundaries, and daemon worker relaunch env—incorrect timing could still false-quiesce or strand workers, but changes are heavily tested and client-owned credentials stay out of resident descriptors.

Overview
Fixes headless and ACP clients finishing a turn before compaction-scheduled work runs, by tracking a settlement promise in AgentSession.waitForIdle() so timer-driven post-compaction continuations are part of the idle contract (including cancel/reschedule paths).

ACP now treats session/prompt as admissible only after an extra waitForIdle(), emits quiescence _meta (outstanding subagents + remaining autonomous continuations from a live roster snapshot), hardens session/new against concurrent creation and failed initial snapshots, and adjusts daemon attach so reattachable ACP sessions use resident lifecycle while still forwarding launchEnv for model/proxy credentials.

Daemon supervisor persists launchEnv on resident worker descriptors (not client-owned) and reapplies it on worker relaunch after supervisor restart; tests cover ACP kernel namespace reconnect and resident env recovery.

^{Reviewed by Cursor Bugbot for commit 01a590f. Bugbot is set up for automated code reviews on this repo. Configure here.}