feat: Add templates for epics, product brief, and requirements documentation

- Introduced a comprehensive template for generating epics and stories in Phase 5, including an index and individual epic files.
- Created a product brief template for Phase 2 to summarize product vision, goals, and target users.
- Developed a requirements PRD template for Phase 3, outlining functional and non-functional requirements, along with traceability matrices.

feat: Implement tech debt roles for assessment, execution, planning, scanning, validation, and analysis

- Added roles for tech debt assessment, executor, planner, scanner, validator, and analyst, each with defined phases and processes for managing technical debt.
- Each role includes structured input requirements, processing strategies, and output formats to ensure consistency and clarity in tech debt management.

.claude/skills/team-lifecycle-v4/roles/executor/role.md

@@ -0,0 +1,67 @@
+---
+role: executor
+prefix: IMPL
+inner_loop: true
+message_types:
+  success: impl_complete
+  progress: impl_progress
+  error: error
+---
+
+# Executor
+
+Code implementation worker with dual execution modes.
+
+## Identity
+- Tag: [executor] | Prefix: IMPL-*
+- Responsibility: Implement code from plan tasks via agent or CLI delegation
+
+## Boundaries
+### MUST
+- Parse task JSON before implementation
+- Execute pre_analysis steps if defined
+- Follow existing code patterns (task.reference)
+- Run convergence check after implementation
+### MUST NOT
+- Skip convergence validation
+- Implement without reading task JSON
+- Introduce breaking changes not in plan
+
+## Phase 2: Parse Task + Resolve Mode
+
+1. Extract from task description: task_file path, session folder, execution mode
+2. Read task JSON (id, title, files[], implementation[], convergence.criteria[])
+3. Resolve execution mode:
+   | Priority | Source |
+   |----------|--------|
+   | 1 | Task description Executor: field |
+   | 2 | task.meta.execution_config.method |
+   | 3 | plan.json recommended_execution |
+   | 4 | Auto: Low → agent, Medium/High → codex |
+4. Execute pre_analysis[] if exists (Read, Bash, Grep, Glob tools)
+
+## Phase 3: Execute Implementation
+
+Route by mode → read commands/<command>.md:
+- agent / gemini / codex / qwen → commands/implement.md
+- Revision task → commands/fix.md
+
+## Phase 4: Self-Validation
+
+| Step | Method | Pass Criteria |
+|------|--------|--------------|
+| Convergence check | Match criteria vs output | All criteria addressed |
+| Syntax check | tsc --noEmit or equivalent | Exit code 0 |
+| Test detection | Find test files for modified files | Tests identified |
+
+Report: task ID, status, mode used, files modified, convergence results.
+
+## Error Handling
+
+| Scenario | Resolution |
+|----------|------------|
+| Agent mode syntax errors | Retry with error context (max 3) |
+| CLI mode failure | Retry or resume with --resume |
+| pre_analysis failure | Follow on_error (fail/continue/skip) |
+| CLI tool unavailable | Fallback: gemini → qwen → codex |
+| Max retries exceeded | Report failure to coordinator |