docs: update tasks for persistent terminal sessions

- Mark completed backend and frontend tasks
- Remaining: testing and documentation

Refs: persistent-terminal-sessions

openspec/changes/persistent-terminal-sessions/tasks.md

@@ -1,51 +1,51 @@
 ## 1. Backend - TerminalSession Refactoring
 
-- [ ] 1.1 Add circular output buffer to TerminalSession (10KB, stores raw bytes)
-- [ ] 1.2 Add WebSocket connection tracking (support multiple connections, detach without closing)
-- [ ] 1.3 Add last_activity timestamp and idle timeout support
-- [ ] 1.4 Add reset() method to kill process and prepare for restart
-- [ ] 1.5 Add health check for docker exec process
-- [ ] 1.6 Modify read_output to also write to circular buffer
+- [x] 1.1 Add circular output buffer to TerminalSession (10KB, stores raw bytes)
+- [x] 1.2 Add WebSocket connection tracking (support multiple connections, detach without closing)
+- [x] 1.3 Add last_activity timestamp and idle timeout support
+- [x] 1.4 Add reset() method to kill process and prepare for restart
+- [x] 1.5 Add health check for docker exec process
+- [x] 1.6 Modify read_output to also write to circular buffer
 
 ## 2. Backend - TerminalManager Refactoring
 
-- [ ] 2.1 Change session tracking from session_id to instance_id
-- [ ] 2.2 Add get_or_create_session() method (reattach if exists, create if not)
-- [ ] 2.3 Modify create_session to support reconnection (don't always create new)
-- [ ] 2.4 Add reset_session() method (kill existing, create new)
-- [ ] 2.5 Add attach_websocket() method (add WebSocket to existing session, replay buffer)
-- [ ] 2.6 Add detach_websocket() method (remove WebSocket, keep session alive)
-- [ ] 2.7 Add idle timeout background task (check every minute, cleanup after 30min)
-- [ ] 2.8 Handle concurrent connections (close old WebSocket when new one connects)
+- [x] 2.1 Change session tracking from session_id to instance_id
+- [x] 2.2 Add get_or_create_session() method (reattach if exists, create if not)
+- [x] 2.3 Modify create_session to support reconnection (don't always create new)
+- [x] 2.4 Add reset_session() method (kill existing, create new)
+- [x] 2.5 Add attach_websocket() method (add WebSocket to existing session, replay buffer)
+- [x] 2.6 Add detach_websocket() method (remove WebSocket, keep session alive)
+- [x] 2.7 Add idle timeout background task (check every minute, cleanup after 30min)
+- [x] 2.8 Handle concurrent connections (close old WebSocket when new one connects)
 
 ## 3. Backend - Terminal WebSocket Endpoint
 
-- [ ] 3.1 Modify endpoint to check for existing session first
-- [ ] 3.2 Add reconnection logic (attach to existing vs create new)
-- [ ] 3.3 Handle reset command from WebSocket (JSON message type: "reset")
-- [ ] 3.4 Add buffer replay on WebSocket attach
-- [ ] 3.5 Add proper cleanup on WebSocket disconnect (detach, don't kill)
+- [x] 3.1 Modify endpoint to check for existing session first
+- [x] 3.2 Add reconnection logic (attach to existing vs create new)
+- [x] 3.3 Handle reset command from WebSocket (JSON message type: "reset")
+- [x] 3.4 Add buffer replay on WebSocket attach
+- [x] 3.5 Add proper cleanup on WebSocket disconnect (detach, don't kill)
 
 ## 4. Backend - API Reset Endpoint
 
-- [ ] 4.1 Add POST /api/projects/{project_id}/repositories/{repo_id}/instances/{instance_id}/terminal/reset endpoint
-- [ ] 4.2 Add authorization checks
-- [ ] 4.3 Call TerminalManager.reset_session()
-- [ ] 4.4 Return success/error response
+- [x] 4.1 Add POST /api/projects/{project_id}/repositories/{repo_id}/instances/{instance_id}/terminal/reset endpoint
+- [x] 4.2 Add authorization checks
+- [x] 4.3 Call TerminalManager.reset_session()
+- [x] 4.4 Return success/error response
 
 ## 5. Frontend - Terminal Component
 
-- [ ] 5.1 Add "Reset Terminal" button to terminal UI
-- [ ] 5.2 Handle WebSocket reconnection gracefully
-- [ ] 5.3 Display "Reconnecting..." indicator
-- [ ] 5.4 Handle reset confirmation dialog
-- [ ] 5.5 Display session status (connected, reconnecting, reset)
+- [x] 5.1 Add "Reset Terminal" button to terminal UI
+- [x] 5.2 Handle WebSocket reconnection gracefully
+- [x] 5.3 Display "Reconnecting..." indicator
+- [x] 5.4 Handle reset confirmation dialog
+- [x] 5.5 Display session status (connected, reconnecting, reset)
 
 ## 6. Frontend - Terminal Hook
 
-- [ ] 6.1 Add reconnection logic with exponential backoff
-- [ ] 6.2 Handle buffer replay on reconnect (process incoming bytes)
-- [ ] 6.3 Add reset function (send WebSocket message or call API)
+- [x] 6.1 Add reconnection logic with exponential backoff
+- [x] 6.2 Handle buffer replay on reconnect (process incoming bytes)
+- [x] 6.3 Add reset function (send WebSocket message or call API)
 - [ ] 6.4 Add heartbeat/ping to detect disconnections faster
 
 ## 7. Testing