Add quality gates, role library, and templates for team lifecycle v3

- Introduced quality gates documentation outlining scoring dimensions and per-phase criteria.
- Created a dynamic role library with definitions for core and specialist roles, including data engineer, devops engineer, ml engineer, orchestrator, performance optimizer, and security expert.
- Added templates for architecture documents, epics and stories, product briefs, and requirements PRD to standardize outputs across phases.

.claude/skills/team-lifecycle-v2/CHANGELOG.md

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+# Changelog
+
+## v2.1 - Architecture Fix (2026-03-05)
+
+### Fixed
+- **Critical**: Removed subagent calls from worker role-specs
+- Workers now correctly use CLI tools instead of attempting Agent() spawn
+- Removed subagents directory (workers cannot use it)
+- Updated SKILL.md to clarify architectural constraints
+
+### Changed
+- Multi-perspective critique: Now uses parallel CLI calls
+- Codebase exploration: Now uses `ccw cli --tool gemini`
+- Document generation: Now uses `ccw cli --tool gemini --mode write`
+
+### Impact
+- No functional change for users
+- Implementation now architecturally correct
+- Workers will no longer fail with "Unknown skill: Agent"
+
+### Files Modified
+- `SKILL.md`: Replaced "Subagent Registry" with "CLI Tool Usage in Workers"
+- `role-specs/analyst.md`: Removed `subagents: [discuss]`, replaced discuss subagent call with parallel CLI calls
+- `role-specs/writer.md`: Removed `subagents: [discuss]`, replaced discuss subagent call with parallel CLI calls
+- `role-specs/reviewer.md`: Removed `subagents: [discuss]`, replaced discuss subagent call with parallel CLI calls
+- `role-specs/planner.md`: Updated complexity routing table to reference CLI exploration
+- `role-specs/architect.md`: Removed `subagents: [explore]`
+- `subagents/`: Directory removed
+
+### Technical Details
+
+**Why Workers Cannot Spawn Subagents**:
+When a worker attempts `Agent()`, it fails with "Unknown skill: Agent". Only the Coordinator (main conversation context) can spawn agents.
+
+**Worker Capabilities**:
+- ✅ Built-in tools: Read, Write, Edit, Bash, Grep, Glob
+- ✅ CLI tools: `ccw cli --tool gemini/codex/qwen`
+- ❌ Agent spawn: Cannot call `Agent()` to spawn subagents
+
+**Multi-Perspective Critique Implementation**:
+Workers now use parallel CLI calls with `run_in_background: true`:
+```bash
+Bash(`ccw cli -p "..." --tool gemini --mode analysis`, { run_in_background: true })
+Bash(`ccw cli -p "..." --tool codex --mode analysis`, { run_in_background: true })
+Bash(`ccw cli -p "..." --tool claude --mode analysis`, { run_in_background: true })
+```