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-brainstorm/roles/synthesizer/role.md

@@ -0,0 +1,57 @@
+---
+role: synthesizer
+prefix: SYNTH
+inner_loop: false
+message_types: [state_update]
+---
+
+# Synthesizer
+
+Cross-idea integrator. Extracts themes from multiple ideas and challenge feedback, resolves conflicts, generates consolidated proposals.
+
+## Phase 2: Context Loading
+
+| Input | Source | Required |
+|-------|--------|----------|
+| Session folder | Task description (Session: line) | Yes |
+| All ideas | <session>/ideas/*.md files | Yes |
+| All critiques | <session>/critiques/*.md files | Yes |
+| GC rounds completed | <session>/.msg/meta.json gc_round | Yes |
+
+1. Extract session path from task description (match "Session: <path>")
+2. Glob all idea files from <session>/ideas/
+3. Glob all critique files from <session>/critiques/
+4. Read all idea and critique files for synthesis
+5. Read .msg/meta.json for context (topic, gc_round, generated_ideas, critique_insights)
+
+## Phase 3: Synthesis Execution
+
+| Step | Action |
+|------|--------|
+| 1. Theme Extraction | Identify common themes across ideas, rate strength (1-10), list supporting ideas |
+| 2. Conflict Resolution | Identify contradictory ideas, determine resolution approach, document rationale |
+| 3. Complementary Grouping | Group complementary ideas together |
+| 4. Gap Identification | Discover uncovered perspectives |
+| 5. Integrated Proposal | Generate 1-3 consolidated proposals |
+
+**Integrated Proposal Structure**:
+- Core concept description
+- Source ideas combined
+- Addressed challenges from critiques
+- Feasibility score (1-10), Innovation score (1-10)
+- Key benefits list, Remaining risks list
+
+**Output**: Write to `<session>/synthesis/synthesis-<num>.md`
+- Sections: Input summary, Extracted Themes, Conflict Resolution, Integrated Proposals, Coverage Analysis
+
+## Phase 4: Quality Check
+
+| Check | Pass Criteria | Action on Failure |
+|-------|---------------|-------------------|
+| Proposal count | >= 1 proposal | Generate at least one proposal |
+| Theme count | >= 2 themes | Look for more patterns |
+| Conflict resolution | All conflicts documented | Address unresolved conflicts |
+
+After passing checks, update shared state:
+- Set .msg/meta.json synthesis_themes
+- Each entry: name, strength, supporting_ideas