review fix: restore idle after between-turn cancellation

packages/ui/acp/src/index.ts

@@ -830,7 +830,8 @@ export function apply(ctx: Context, config: AcpConfig): void {
         // not-yet-started prompt never runs, while a prompt accepted afterward
         // remains a separate queued turn. Scoped to THIS session's
         // agent — a cancel in one session never touches another's stream or
-        // pending prompt (RFC 011 isolation). We ALSO settle the in-flight prompt
+        // pending prompt (multi-session isolation).
+        // We ALSO settle the in-flight prompt
         // as cancelled directly here: do NOT rely on the resulting turn/end to
         // settle it, because cancel() may drop the turn before any turn/end is
         // emitted, and removing this direct settle would move the RPC's

packages/ui/acp/tests/dispose.spec.ts

@@ -223,7 +223,8 @@ describe('acp bridge — disposal & HMR safety', () => {
 
   it('per-session AgentHandle dispose leaves sibling agents untouched', async () => {
     // The factory returns a per-agent AgentHandle whose dispose() tears down
-    // EXACTLY that agent + its session — RFC 011 isolation. Create two agents
+    // EXACTLY that agent + its session — the registry's per-handle isolation
+    // contract. Create two agents
     // directly through the registry factory (the same path the ACP bridge uses),
     // dispose one handle, and assert the other survives, registered and
     // queryable, with its session still in the store.

packages/ui/acp/tests/multi-session.spec.ts

@@ -14,7 +14,7 @@ function messageTextFor(updates: { sessionId?: string; update: CapturedUpdate }[
     .join('')
 }
 
-describe('acp bridge — RFC 011 multi-session isolation', () => {
+describe('acp bridge — multi-session isolation', () => {
   let storageDir: string
   let harness: BridgeHarness | undefined