feat: update empty state messages and hints in English and Chinese locales

refactor: rename variables for clarity in ReviewSessionPage and SessionsPage

fix: update version check logic in SettingsPage

chore: remove unused imports in TeamPage and session-detail components

fix: enhance error handling in MCP server

fix: apply default mode in edit-file tool handler

chore: remove tsbuildinfo file

docs: add Quick Plan & Execute phase documentation for issue discovery

chore: clean up ping output file

.codex/skills/ccw-loop/SKILL.md

@@ -21,7 +21,7 @@ Stateless iterative development loop using Codex single-agent deep interaction p
 |              loop-v2-routes.ts (Control Plane)               |
 |                                                              |
 |  State: {projectRoot}/.workflow/.loop/{loopId}.json (MASTER)  |
-|  Tasks: {projectRoot}/.workflow/.loop/{loopId}.tasks.jsonl   |
+|  Tasks: {projectRoot}/.workflow/.loop/{loopId}/.task/*.json  |
 |                                                              |
 |  /start  -> Trigger ccw-loop skill with --loop-id           |
 |  /pause  -> Set status='paused' (skill checks before action) |
@@ -60,13 +60,13 @@ Stateless iterative development loop using Codex single-agent deep interaction p
 ## Prep Package Integration
 
 When `prep-package.json` exists at `{projectRoot}/.workflow/.loop/prep-package.json`, Phase 1 consumes it to:
-- Load pre-built task list from `prep-tasks.jsonl` instead of generating tasks from scratch
+- Load pre-built task list from `.task/*.json` files instead of generating tasks from scratch
 - Apply auto-loop config (max_iterations, timeout)
 - Preserve source provenance and convergence criteria from upstream planning/analysis skills
 
 Prep packages are generated by the interactive prompt `/prompts:prep-loop`, which accepts JSONL from:
-- `collaborative-plan-with-file` (tasks.jsonl)
-- `analyze-with-file` (tasks.jsonl)
+- `collaborative-plan-with-file` (.task/*.json)
+- `analyze-with-file` (.task/*.json)
 - `brainstorm-to-cycle` (cycle-task.md → converted to task format)
 
 See [phases/00-prep-checklist.md](phases/00-prep-checklist.md) for schema and validation rules.
@@ -151,7 +151,8 @@ close_agent → return finalState
 ```
 {projectRoot}/.workflow/.loop/
 ├── {loopId}.json              # Master state file (API + Skill shared)
-├── {loopId}.tasks.jsonl       # Task list (API managed)
+├── {loopId}/.task/            # Task files directory (API managed)
+│   └── TASK-{id}.json         # Individual task files (task-schema.json)
 └── {loopId}.progress/         # Skill progress files
     ├── develop.md             # Development progress timeline
     ├── debug.md               # Understanding evolution document

.codex/skills/ccw-loop/phases/00-prep-checklist.md

@@ -20,7 +20,7 @@ Schema reference for `prep-package.json` consumed by ccw-loop Phase 1. Generated
   "source": {
     "tool": "collaborative-plan-with-file | analyze-with-file | brainstorm-to-cycle | manual",
     "session_id": "string",
-    "jsonl_path": "absolute path to original JSONL",
+    "task_dir": "absolute path to source .task/ directory",
     "task_count": "number",
     "tasks_with_convergence": "number"
   },
@@ -40,9 +40,9 @@ Schema reference for `prep-package.json` consumed by ccw-loop Phase 1. Generated
 }
 ```
 
-## prep-tasks.jsonl Schema
+## .task/*.json Schema (task-schema.json)
 
-One task per line, each in ccw-loop `develop.tasks[]` format with extended fields:
+One task per file in `.task/` directory, each following `task-schema.json` with ccw-loop extended fields:
 
 ```json
 {
@@ -71,8 +71,8 @@ One task per line, each in ccw-loop `develop.tasks[]` format with extended field
 | 2 | target_skill | `=== "ccw-loop"` | Skip prep, use default INIT |
 | 3 | project_root | Matches current `projectRoot` | Skip prep, warn mismatch |
 | 4 | freshness | `generated_at` within 24h | Skip prep, warn stale |
-| 5 | tasks file | `prep-tasks.jsonl` exists and readable | Skip prep, use default INIT |
-| 6 | tasks content | At least 1 valid task line in JSONL | Skip prep, use default INIT |
+| 5 | tasks dir | `.task/` directory exists with *.json files | Skip prep, use default INIT |
+| 6 | tasks content | At least 1 valid task JSON in `.task/` | Skip prep, use default INIT |
 
 ## Integration Points
 
@@ -89,9 +89,9 @@ if (fs.existsSync(prepPath)) {
 
   if (checks.valid) {
     prepPackage = raw
-    // Load pre-built tasks from prep-tasks.jsonl
-    const tasksPath = `${projectRoot}/.workflow/.loop/prep-tasks.jsonl`
-    const prepTasks = loadPrepTasks(tasksPath)
+    // Load pre-built tasks from .task/*.json
+    const taskDir = `${projectRoot}/.workflow/.loop/.task`
+    const prepTasks = loadPrepTasks(taskDir)
     // → Inject into state.skill_state.develop.tasks
     // → Set max_iterations from auto_loop config
   } else {

.codex/skills/ccw-loop/phases/01-session-init.md

@@ -46,14 +46,14 @@ if (fs.existsSync(prepPath)) {
     prepPackage = raw
 
     // Load pre-built tasks
-    const tasksPath = `${projectRoot}/.workflow/.loop/prep-tasks.jsonl`
-    prepTasks = loadPrepTasks(tasksPath)
+    const taskDir = `${projectRoot}/.workflow/.loop/.task`
+    prepTasks = loadPrepTasks(taskDir)
 
     if (prepTasks && prepTasks.length > 0) {
       console.log(`✓ Prep package loaded: ${prepTasks.length} tasks from ${prepPackage.source.tool}`)
       console.log(`  Checks passed: ${checks.passed.join(', ')}`)
     } else {
-      console.warn(`⚠ Prep tasks file empty or invalid, falling back to default INIT`)
+      console.warn(`Warning: Prep tasks directory empty or invalid, falling back to default INIT`)
       prepPackage = null
       prepTasks = null
     }
@@ -103,12 +103,13 @@ function validateLoopPrepPackage(prep, projectRoot) {
     failures.push(`prep-package is ${Math.round(hoursSince)}h old (max 24h), may be stale`)
   }
 
-  // Check 5: prep-tasks.jsonl must exist
-  const tasksPath = `${projectRoot}/.workflow/.loop/prep-tasks.jsonl`
-  if (fs.existsSync(tasksPath)) {
-    passed.push('prep-tasks.jsonl exists')
+  // Check 5: .task/ directory must exist with task files
+  const taskDir = `${projectRoot}/.workflow/.loop/.task`
+  const taskFiles = Glob(`${taskDir}/*.json`)
+  if (fs.existsSync(taskDir) && taskFiles.length > 0) {
+    passed.push(`.task/ exists (${taskFiles.length} files)`)
   } else {
-    failures.push('prep-tasks.jsonl not found')
+    failures.push('.task/ directory not found or empty')
   }
 
   // Check 6: task count > 0
@@ -126,24 +127,24 @@ function validateLoopPrepPackage(prep, projectRoot) {
 }
 
 /**
- * Load pre-built tasks from prep-tasks.jsonl.
+ * Load pre-built tasks from .task/*.json directory.
  * Returns array of task objects or null on failure.
  */
-function loadPrepTasks(tasksPath) {
-  if (!fs.existsSync(tasksPath)) return null
+function loadPrepTasks(taskDir) {
+  if (!fs.existsSync(taskDir)) return null
 
-  const content = Read(tasksPath)
-  const lines = content.trim().split('\n').filter(l => l.trim())
+  const taskFiles = Glob(`${taskDir}/*.json`).sort()
   const tasks = []
 
-  for (const line of lines) {
+  for (const filePath of taskFiles) {
     try {
-      const task = JSON.parse(line)
+      const content = Read(filePath)
+      const task = JSON.parse(content)
       if (task.id && task.description) {
         tasks.push(task)
       }
     } catch (e) {
-      console.warn(`⚠ Skipping invalid task line: ${e.message}`)
+      console.warn(`Warning: Skipping invalid task file ${filePath}: ${e.message}`)
     }
   }