Message enqueuing + steering for Claude and Ada (unify with Codex)

[germanescobar]

Closes #113.

Brings Codex's enqueue + steer model to Claude and Ada with a unified keymap across all three agents.

Behavior

While a run is streaming:

Key	Action
Enter	Enqueue the message for the next run
Shift+Enter	Steer the running turn (composer text, or the first enqueued message if empty)

When idle, Enter sends and Shift+Enter is a newline (unchanged).

• Steering: Codex uses native turn/steer. Claude/Ada have no native steer, so they stop the run and resume with the steer text only. The composer is disabled during the stop→resume transition to avoid a race.
• Queue: persisted server-side per session at ~/coding-orchestrator/queues/<sessionId>.json, drained one-at-a-time on clean completion. Failures/cancellations leave the queue intact.
• Durable, server-driven advancement: the stream handler can run headlessly, so the queue advances even when no client is connected (you're on another session, reloaded, or closed the app). The client observes server-driven runs via a runtime poll and keeps the queue list in sync.
• UI: a visible list above the composer shows queued messages with a remove action.

Implementation

• server/lib/session-queue.ts — per-session queue persistence (enqueue/list/remove/dequeueFirst/clearQueue) with per-session locking; paths.ts helpers.
• server/routes/sessions.ts — queue CRUD routes; handleSessionStream extracted and invoked headlessly by advanceSessionQueue on clean completion (both CLI and Codex app-server paths); queue cleared on archive.
• client/src/api.ts — queue API client.
• client/src/pages/SessionView.tsx — unified keymap, enqueue/steer handlers (native + emulated), queue list UI, server-driven run observation.

Testing

• server/lib/__tests__/session-queue.test.ts — 7 unit tests (ordering, dequeue, remove, isolation, clear, concurrency).
• Full suite: 83/83 pass; server + client tsc --noEmit clean.
• ⚠️ The end-to-end server-driven advancement chain (spawning a real agent) is manually verified; an automated test would need a fake-provider harness.

🤖 Generated with Claude Code