Add orchestration loop phase and workflow execution skill

- Implemented Phase 2: Orchestration Loop for CCW Loop, including executor agent spawning, main loop execution, and iteration management.
- Introduced helper functions for action result parsing and user interaction.
- Created new skill: workflow-execute, coordinating agent execution for workflow tasks with automatic session discovery, parallel task processing, and status tracking.
- Defined execution flow, key design principles, and error handling strategies for the workflow execution process.

.codex/skills/ccw-loop/actions/action-menu.md

@@ -0,0 +1,205 @@
+# Action: MENU
+
+Display interactive action menu for user selection.
+
+## Purpose
+
+- Show current state summary
+- Display available actions
+- Wait for user selection
+- Return selected action
+
+## Preconditions
+
+- [ ] state.status === 'running'
+- [ ] state.skill_state !== null
+- [ ] mode === 'interactive'
+
+## Execution Steps
+
+### Step 1: Verify Control Signals
+
+```javascript
+const state = JSON.parse(Read(`.workflow/.loop/${loopId}.json`))
+
+if (state.status !== 'running') {
+  return {
+    action: 'MENU',
+    status: 'failed',
+    message: `Cannot show menu: status is ${state.status}`,
+    next_action: state.status === 'paused' ? 'PAUSED' : 'STOPPED'
+  }
+}
+```
+
+### Step 2: Generate Status Summary
+
+```javascript
+// Development progress
+const developProgress = state.skill_state.develop.total > 0
+  ? `${state.skill_state.develop.completed}/${state.skill_state.develop.total} (${((state.skill_state.develop.completed / state.skill_state.develop.total) * 100).toFixed(0)}%)`
+  : 'Not started'
+
+// Debug status
+const debugStatus = state.skill_state.debug.confirmed_hypothesis
+  ? 'Root cause found'
+  : state.skill_state.debug.iteration > 0
+    ? `Iteration ${state.skill_state.debug.iteration}`
+    : 'Not started'
+
+// Validation status
+const validateStatus = state.skill_state.validate.passed
+  ? 'PASSED'
+  : state.skill_state.validate.test_results.length > 0
+    ? `FAILED (${state.skill_state.validate.failed_tests.length} failures)`
+    : 'Not run'
+```
+
+### Step 3: Display Menu
+
+```javascript
+const menuDisplay = `
+================================================================
+  CCW Loop - ${loopId}
+================================================================
+
+  Task: ${state.description}
+  Iteration: ${state.current_iteration}
+
+  +-----------------------------------------------------+
+  |  Phase          |  Status                           |
+  +-----------------------------------------------------+
+  |  Develop        |  ${developProgress.padEnd(35)}|
+  |  Debug          |  ${debugStatus.padEnd(35)}|
+  |  Validate       |  ${validateStatus.padEnd(35)}|
+  +-----------------------------------------------------+
+
+================================================================
+
+MENU_OPTIONS:
+1. [develop] Continue Development - ${state.skill_state.develop.total - state.skill_state.develop.completed} tasks pending
+2. [debug] Start Debugging - ${debugStatus}
+3. [validate] Run Validation - ${validateStatus}
+4. [status] View Detailed Status
+5. [complete] Complete Loop
+6. [exit] Exit (save and quit)
+`
+
+console.log(menuDisplay)
+```
+
+## Output Format
+
+```
+ACTION_RESULT:
+- action: MENU
+- status: success
+- message: ${menuDisplay}
+
+MENU_OPTIONS:
+1. [develop] Continue Development - {N} tasks pending
+2. [debug] Start Debugging - {status}
+3. [validate] Run Validation - {status}
+4. [status] View Detailed Status
+5. [complete] Complete Loop
+6. [exit] Exit (save and quit)
+
+NEXT_ACTION_NEEDED: WAITING_INPUT
+```
+
+## User Input Handling
+
+When user provides input, orchestrator sends it back via `send_input`:
+
+```javascript
+// User selects "develop"
+send_input({
+  id: agent,
+  message: `
+## USER INPUT RECEIVED
+
+Action selected: develop
+
+## EXECUTE SELECTED ACTION
+
+Execute DEVELOP action.
+`
+})
+```
+
+## Status Detail View
+
+If user selects "status":
+
+```javascript
+const detailView = `
+## Detailed Status
+
+### Development Progress
+
+${Read(`${progressDir}/develop.md`)?.substring(0, 1000) || 'No progress recorded'}
+
+### Debug Status
+
+${state.skill_state.debug.hypotheses.length > 0
+  ? state.skill_state.debug.hypotheses.map(h => `  ${h.id}: ${h.status} - ${h.description.substring(0, 50)}...`).join('\n')
+  : '  No debugging started'}
+
+### Validation Results
+
+${state.skill_state.validate.test_results.length > 0
+  ? `  Last run: ${state.skill_state.validate.last_run_at}
+  Pass rate: ${state.skill_state.validate.pass_rate}%`
+  : '  No validation run yet'}
+`
+
+console.log(detailView)
+
+// Return to menu
+return {
+  action: 'MENU',
+  status: 'success',
+  message: detailView,
+  next_action: 'MENU'  // Show menu again
+}
+```
+
+## Exit Handling
+
+If user selects "exit":
+
+```javascript
+// Save current state
+state.status = 'user_exit'
+state.updated_at = getUtc8ISOString()
+Write(`.workflow/.loop/${loopId}.json`, JSON.stringify(state, null, 2))
+
+return {
+  action: 'MENU',
+  status: 'success',
+  message: 'Session saved. Use --loop-id to resume.',
+  next_action: 'COMPLETED'
+}
+```
+
+## Action Mapping
+
+| User Selection | Next Action |
+|----------------|-------------|
+| develop | DEVELOP |
+| debug | DEBUG |
+| validate | VALIDATE |
+| status | MENU (after showing details) |
+| complete | COMPLETE |
+| exit | COMPLETED (save and exit) |
+
+## Error Handling
+
+| Error Type | Recovery |
+|------------|----------|
+| Invalid selection | Show menu again |
+| User cancels | Return to menu |
+
+## Next Actions
+
+Based on user selection - forwarded via `send_input` by orchestrator.