## 1. Add PTY exit notifications

- [ ] 1.1 Extend booterm WS protocol to send `<pty_exited>` payload (exit code, last output, runtime)
- [ ] 1.2 Wire into apps/coder so AI receives exit notification
- [ ] 1.3 Add frontend display of exit status

## 2. Add session metadata for PTY panes

- [ ] 2.1 Add title, description, parentAgent, taskId fields to PTY session
- [ ] 2.2 Store metadata in session store
- [ ] 2.3 Display metadata in terminal pane header
- [ ] 2.4 Allow AI agents to query metadata

## 3. Add pattern-based log search

- [ ] 3.1 Add pty_read with regex pattern filtering
- [ ] 3.2 Add offset/limit pagination

## 4. Add per-session timeouts

- [ ] 4.1 Add timeoutSeconds parameter
- [ ] 4.2 Implement auto-kill on timeout
- [ ] 4.3 Send timeout exit notification

## 5. Add sandbox circuit breaker

- [ ] 5.1 Implement consecutive failure tracking (threshold: 2)
- [ ] 5.2 On threshold: abort thread, post notification
- [ ] 5.3 Add SandboxCircuitBreakerMiddleware

## 6. Add sandbox lifecycle management

- [ ] 6.1 Implement 4-case lifecycle: cached→reconnect, creating→reset, missing→create, metadata→reconnect

## 7. Add X-Agent-Flags header support

- [ ] 7.1 Parse X-Agent-Flags header in sidecar proxy
- [ ] 7.2 Apply per-request flag overrides
- [ ] 7.3 Add agent-specific flag config in AGENTS.md

## 8. UI: Terminal enhancements

- [ ] 8.1 Show exit code and runtime in terminal footer
- [ ] 8.2 Show agent attribution
- [ ] 8.3 Add log search UI with regex
- [ ] 8.4 Add timeout countdown indicator
- [ ] 8.5 Add circuit breaker indicator