feat: implement reusable feedback capability for continuous improvement

Add comprehensive feedback system that enables lightweight, unstructured feedback
collection from users of the issue-facade capability, establishing a continuous
improvement loop grounded in real-world usage.

Core Components:
- .feedback/ directory structure (inbound, reviewed, archived)
- Standalone CLI tool (.capability/feedback) for submission and management
- Comprehensive documentation (.feedback/README.md)
- Integration examples and usage guides

Key Features:
- Multiple submission methods (CLI, Makefile, direct file drop)
- No structure imposement - accepts any text/markdown format
- Automatic metadata capture (timestamp, git context, version)
- Maintainer workflow (list, review, archive, create issues)
- Colored terminal output for better UX
- Future-ready for API endpoint evolution

Integration:
- Updated CAPABILITY.yaml with feedback section
- Enhanced CLAUDE.md with comprehensive integration guide
- Added Makefile commands (feedback, feedback-list, feedback-stats, etc.)
- Created detailed usage examples (examples/feedback-example.md)

Design Philosophy:
- Capability-agnostic pattern (reusable across all markitect capabilities)
- Decentralized (each capability owns its feedback)
- Flexible (no required formats or fields)
- Durable (plain markdown files, git-tracked)
- Actionable (feedback lives where maintainers work)
- Scalable (works for 1 user or 1000 users)

Feedback Submission Examples:
  ./.capability/feedback submit "Your feedback"
  make feedback MSG="Your feedback"
  echo "Feedback" > .feedback/inbound/$(date +%Y%m%d)-feedback.md

Maintainer Workflow:
  make feedback-list                    # List pending
  make feedback-stats                   # Show statistics
  make feedback-review-issue FILE=xxx   # Review and create issue

This establishes a robust continuous improvement loop:
User Experience → Feedback → Review → Action → Improved Capability

The pattern is designed to be copied to any capability in the markitect
project, providing consistent feedback collection across all capabilities.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Makefile

@@ -38,6 +38,13 @@ help: ## Show issue facade capability help
 	@echo "  test-cov                     Run tests with coverage report"
 	@echo "  test-verbose                 Run tests with verbose output"
 	@echo ""
+	@echo "Feedback & Continuous Improvement:"
+	@echo "  feedback MSG=\"...\"            Submit feedback about issue-facade"
+	@echo "  feedback-list                List pending feedback"
+	@echo "  feedback-stats               Show feedback statistics"
+	@echo "  feedback-show FILE=\"...\"      Show specific feedback"
+	@echo "  feedback-review FILE=\"...\"    Review feedback (maintainers)"
+	@echo ""
 	@echo "Development & Setup (from parent):"
 	@echo "  issue-facade-install         Install issue facade capability"
 	@echo "  issue-facade-install-dev     Install with development dependencies"
@@ -202,6 +209,31 @@ test-cov: ## Run tests with coverage report (local development)
 test-verbose: ## Run tests with verbose output (local development)
 	pytest tests/ -v
 
+# Feedback and Continuous Improvement
+.PHONY: feedback
+feedback: ## Submit feedback (Usage: make feedback MSG="your feedback")
+	@./.capability/feedback submit "$(MSG)"
+
+.PHONY: feedback-list
+feedback-list: ## List pending feedback
+	@./.capability/feedback list
+
+.PHONY: feedback-stats
+feedback-stats: ## Show feedback statistics
+	@./.capability/feedback stats
+
+.PHONY: feedback-show
+feedback-show: ## Show specific feedback (Usage: make feedback-show FILE=20251217-xxx.md)
+	@./.capability/feedback show "$(FILE)"
+
+.PHONY: feedback-review
+feedback-review: ## Review feedback (Usage: make feedback-review FILE=20251217-xxx.md)
+	@./.capability/feedback review "$(FILE)"
+
+.PHONY: feedback-review-issue
+feedback-review-issue: ## Review feedback and create issue (Usage: make feedback-review-issue FILE=20251217-xxx.md)
+	@./.capability/feedback review "$(FILE)" --create-issue
+
 .PHONY: issue-facade-install
 issue-facade-install: ## Install issue facade capability
 	pip install -e capabilities/issue-facade/