fix: use literal mode for tmux send-keys, prune stale lifecycle trackers

- Add -l flag to tmux send-keys for short messages so key-like payloads
  (e.g. "Enter", "Escape") are sent as text, not interpreted as keypresses
- Prune states and reactionTrackers maps in pollAll() for sessions that
  no longer appear in the session list, preventing unbounded memory growth
  and stale retry counters from applying to reused session IDs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/core/src/__tests__/tmux.test.ts

@@ -190,7 +190,7 @@ describe("sendKeys", () => {
     expect(escapeArgs).toEqual(["send-keys", "-t", "app-1", "Escape"]);
     // Call 1: text
     const textArgs = mockExecFile.mock.calls[1][1] as string[];
-    expect(textArgs).toEqual(["send-keys", "-t", "app-1", "hello world"]);
+    expect(textArgs).toEqual(["send-keys", "-t", "app-1", "-l", "hello world"]);
     // Call 2: Enter
     const enterArgs = mockExecFile.mock.calls[2][1] as string[];
     expect(enterArgs).toEqual(["send-keys", "-t", "app-1", "Enter"]);

packages/core/src/lifecycle-manager.ts

@@ -453,6 +453,21 @@ export function createLifecycleManager(deps: LifecycleManagerDeps): LifecycleMan
       // Poll all sessions concurrently
       await Promise.allSettled(sessionsToCheck.map((s) => checkSession(s)));
 
+      // Prune stale entries from states and reactionTrackers for sessions
+      // that no longer appear in the session list (e.g., after kill/cleanup)
+      const currentSessionIds = new Set(sessions.map((s) => s.id));
+      for (const trackedId of states.keys()) {
+        if (!currentSessionIds.has(trackedId)) {
+          states.delete(trackedId);
+        }
+      }
+      for (const trackerKey of reactionTrackers.keys()) {
+        const sessionId = trackerKey.split(":")[0];
+        if (sessionId && !currentSessionIds.has(sessionId)) {
+          reactionTrackers.delete(trackerKey);
+        }
+      }
+
       // Check if all sessions are complete (emit only once)
       const activeSessions = sessions.filter((s) => s.status !== "merged" && s.status !== "killed");
       if (sessions.length > 0 && activeSessions.length === 0 && !allCompleteEmitted) {

packages/core/src/tmux.ts

@@ -152,7 +152,9 @@ export async function sendKeys(
       }
     }
   } else {
-    await tmux("send-keys", "-t", sessionName, text);
+    // Use -l (literal) to prevent tmux from interpreting text as key names
+    // (e.g. "Enter", "Escape", "C-c" would be treated as keypresses without -l)
+    await tmux("send-keys", "-t", sessionName, "-l", text);
   }
 
   if (pressEnter) {