feat(ccw): migrate backend to TypeScript

- Convert 40 JS files to TypeScript (CLI, tools, core, MCP server)
- Add Zod for runtime parameter validation
- Add type definitions in src/types/
- Keep src/templates/ as JavaScript (dashboard frontend)
- Update bin entries to use dist/
- Add tsconfig.json with strict mode
- Add backward-compatible exports for tests
- All 39 tests passing

Breaking changes: None (backward compatible)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/commands/workflow/tools/test-concept-enhanced.md

@@ -89,7 +89,7 @@ Template: ~/.claude/workflows/cli-templates/prompts/test/test-concept-analysis.t
 
 ## EXECUTION STEPS
 1. Execute Gemini analysis:
-   cd .workflow/active/{test_session_id}/.process && gemini -p "$(cat ~/.claude/workflows/cli-templates/prompts/test/test-concept-analysis.txt)" --approval-mode yolo
+   ccw cli exec "$(cat ~/.claude/workflows/cli-templates/prompts/test/test-concept-analysis.txt)" --tool gemini --mode write --cd .workflow/active/{test_session_id}/.process
 
 2. Generate TEST_ANALYSIS_RESULTS.md:
    Synthesize gemini-test-analysis.md into standardized format for task generation