docs(project): complete project setup and documentation

- Add agent system constitution with time recording standards
- Add Git workflow documentation for all agents
- Add comprehensive time recording policy (UTC + GMT+8)
- Add CHANGELOG with version history
- Add CONTRIBUTING guide with Git workflow and commit conventions
- Add project specification document
- Add README with project overview
- Add .gitignore for macOS and editor files
- Update CLAUDE.md with project requirements and metadata

Project initialized: 2025-10-04 08:50:35 UTC / 16:50:35 GMT+8

CHANGELOG.md

@@ -0,0 +1,80 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Project initialization and documentation structure
+- Git repository setup with remote configuration
+- Contributing guidelines and Git workflow documentation
+- Agent system constitution with time recording standards
+- Project specification document
+- Time recording policy: All timestamps in UTC and GMT+8
+
+### Documentation
+- Created: 2025-10-04 08:50:35 UTC
+- Created: 2025-10-04 16:50:35 GMT+8
+
+---
+
+## Time Recording Policy
+
+All dates and times in this project must follow these rules:
+
+1. **Never fabricate or hallucinate dates/times**
+2. **Always record in dual format:**
+   - UTC (Coordinated Universal Time)
+   - GMT+8 (Asia/Shanghai timezone)
+3. **Format**: `YYYY-MM-DD HH:MM:SS UTC/GMT+8`
+4. **If time is unknown**: Explicitly state "TBD" or "To be determined"
+
+### Example Format:
+```
+Created: 2025-10-04 08:50:35 UTC
+Created: 2025-10-04 16:50:35 GMT+8
+```
+
+---
+
+## Version History
+
+### [0.1.0] - Project Setup
+**Date**: 2025-10-04 08:50:35 UTC / 2025-10-04 16:50:35 GMT+8
+
+**Added:**
+- Initial project structure
+- Documentation framework
+- Git repository configuration
+- AI agent system setup
+- Version control guidelines
+
+**Repository:**
+- Remote: `ssh://gitea@git.shihong.me:2222/snowprint/halloween-test.git`
+- Branch: `main`
+
+---
+
+## Future Releases
+
+### [1.0.0] - Initial Release (Planned)
+**Target Date**: TBD
+
+**Planned Features:**
+- Halloween event page (index.html)
+- ASCII McDonald's logo
+- Responsive design (desktop + mobile)
+- Terminal aesthetic styling
+- Event information display
+
+---
+
+## Notes
+
+- This changelog is maintained by all team members
+- DevOps engineer is responsible for version tagging
+- All agents must update this file when making significant changes
+- Follow conventional commit format in entries