feat(executor): add multiple executor sessions per task

[bborn]

Summary

• Adds support for multiple executor sessions per task, allowing Claude, Codex, Gemini, and OpenClaw to work on the same task simultaneously
• Each session is tracked independently with its own daemon session, pane IDs, and status
• The UI shows tabs to switch between sessions when multiple exist

Key Changes

• Database: New task_executor_sessions table tracks each executor session
• Model: ExecutorSession struct with full CRUD operations
• Executor: Creates session records when starting task execution
• UI: Session tabs in detail view with < and > keyboard shortcuts

Implementation Details

1. Schema Changes (internal/db/sqlite.go):

   • Added task_executor_sessions table with session metadata
   • Added active_session_id column to tasks table
   • Added session_id column to task_logs for log association

2. Model Changes (internal/db/tasks.go):

   • ExecutorSession struct with status tracking
   • CRUD methods: CreateExecutorSession, GetExecutorSession, etc.
   • GetActiveExecutorSession for finding the current running session
   • AppendTaskLogForSession for session-specific logging

3. Executor Changes (internal/executor/executor.go):

   • Creates ExecutorSession when starting new task execution
   • Updates session status on completion/failure

4. UI Changes (internal/ui/detail.go):

   • renderSessionTabs() shows tabs when multiple sessions exist
   • SelectNextSession()/SelectPrevSession() for navigation
   • Handles < and > keys for tab switching

Test plan

• Build passes
• All existing tests pass
• New executor_session_test.go tests pass
• Manual testing of session switching in UI
• Test creating multiple executor sessions for same task

🤖 Generated with Claude Code

[bborn]

No. bloat.