feat: enhance spec loading capabilities and add new categories

- Added support for loading specs from new categories: debug, test, review, and validation.
- Updated various agents and skills to include instructions for loading project context from the new spec categories.
- Introduced new spec documents for test conventions, review standards, and validation rules to improve project guidelines.
- Enhanced the frontend to support new watcher settings and display auto-watch status.
- Improved the spec index builder to accommodate new categories and ensure proper loading of specifications.

.claude/skills/workflow-tdd-plan/phases/05-tdd-task-generation.md

@@ -237,13 +237,14 @@ MCP Capabilities: {exa_code, exa_web, code_index}
 These files provide project-level constraints that apply to ALL tasks:
 
 1. **ccw spec load --category execution** (project specs and tech analysis)
+2. **ccw spec load --category test** (test framework, coverage targets, conventions)
    - Contains: tech_stack, architecture_type, key_components, build_system, test_framework, coding_conventions, naming_rules, forbidden_patterns, quality_gates, custom_constraints
    - Usage: Populate plan.json shared_context, align task tech choices, set correct test commands
    - Apply as HARD CONSTRAINTS on all generated tasks — task implementation steps,
      acceptance criteria, and convergence.verification MUST respect these guidelines
    - If empty/missing: No additional constraints (proceed normally)
 
-Loading order: \`ccw spec load --category execution\` → planning-notes.md → context-package.json
+Loading order: \`ccw spec load --category execution\` → \`ccw spec load --category test\` → planning-notes.md → context-package.json
 
 ## USER CONFIGURATION (from Phase 0)
 Execution Method: ${userConfig.executionMethod}  // agent|hybrid|cli