chore: import upstream snapshot with attribution

cli-tool/components/skills/development/task-execution-engine/SKILL.md

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+---
+name: task-execution-engine
+description: Execute implementation tasks from design documents using markdown checkboxes. Use when (1) implementing features from feature-design-assistant output, (2) resuming interrupted work, (3) batch executing tasks. Triggers on 'start implementation', 'run tasks', 'resume'.
+---
+
+# Feature Pipeline
+
+Execute implementation tasks directly from design documents. Tasks are managed as markdown checkboxes - no separate session files needed.
+
+## Quick Reference
+
+```bash
+# Get next task
+python3 scripts/task_manager.py next --file <design.md>
+
+# Mark task completed
+python3 scripts/task_manager.py done --file <design.md> --task "Task Title"
+
+# Mark task failed
+python3 scripts/task_manager.py fail --file <design.md> --task "Task Title" --reason "..."
+
+# Show status
+python3 scripts/task_manager.py status --file <design.md>
+```
+
+## Task Format
+
+Tasks are written as markdown checkboxes in the design document:
+
+```markdown
+## Implementation Tasks
+
+- [ ] **Create User model** `priority:1` `phase:model`
+  - files: src/models/user.py, tests/models/test_user.py
+  - [ ] User model has email and password_hash fields
+  - [ ] Email validation implemented
+  - [ ] Password hashing uses bcrypt
+
+- [ ] **Implement JWT utils** `priority:2` `phase:model`
+  - files: src/utils/jwt.py
+  - [ ] generate_token() creates valid JWT
+  - [ ] verify_token() validates JWT
+
+- [ ] **Create auth API** `priority:3` `phase:api` `deps:Create User model,Implement JWT utils`
+  - files: src/api/auth.py
+  - [ ] POST /register endpoint
+  - [ ] POST /login endpoint
+```
+
+See [references/task-format.md](references/task-format.md) for full format specification.
+
+## Execution Loop
+
+```
+LOOP until no tasks remain:
+  1. GET next task (task_manager.py next)
+  2. READ task details (files, criteria)
+  3. IMPLEMENT the task
+  4. VERIFY acceptance criteria
+  5. UPDATE status (task_manager.py done/fail)
+  6. CONTINUE
+```
+
+### Unattended Mode Rules
+
+- **NO stopping** for questions
+- **NO asking** for clarification
+- Make autonomous decisions based on codebase patterns
+- If blocked, mark as failed and continue
+
+## Status Updates
+
+Completed task:
+```markdown
+- [x] **Create User model** `priority:1` `phase:model` ✅
+  - files: src/models/user.py
+  - [x] User model has email field
+  - [x] Password hashing implemented
+```
+
+Failed task:
+```markdown
+- [x] **Create User model** `priority:1` `phase:model` ❌
+  - files: src/models/user.py
+  - [ ] User model has email field
+  - reason: Missing database configuration
+```
+
+## Resume / Recovery
+
+To resume interrupted work, simply run again with the same design file:
+
+```
+/feature-pipeline docs/designs/xxx.md
+```
+
+The task manager will find the first uncompleted task and continue from there.
+
+## Integration
+
+This skill is typically triggered after `/feature-analyzer` completes:
+
+```
+User: /feature-analyzer implement user auth
+
+Claude: [designs feature, generates task list]
+        Design saved to docs/designs/2026-01-02-user-auth.md
+        Ready to start implementation?
+
+User: Yes / 开始实现
+
+Claude: [executes tasks via task-execution-engine]
+```