Add proper metadata, environment declarations, and CHANGELOG

- Add package.json with OpenClaw skill metadata
- Declare PORKBUN_API_KEY and PORKBUN_SECRET_API_KEY in environment
- Document ~/.config/porkbun/config.json as config path
- Add CHANGELOG.md with version history
- Update README with installation instructions and changelog reference
- Addresses security scanner recommendations for credential transparency

CHANGELOG.md

@@ -0,0 +1,60 @@
+# Changelog
+
+All notable changes to the Porkbun DNS skill will be documented in this file.
+
+## [1.0.0] - 2026-02-10
+
+### Added
+- Initial release of Porkbun DNS management skill
+- CLI tool `scripts/porkbun-dns.js` for all DNS operations
+- Support for common record types: A, AAAA, CNAME, MX, TXT, NS, ALIAS, SRV, TLSA, CAA, HTTPS, SVCB, SSHFP
+- Domain listing and status checking
+- DNS record create, read, update, delete (CRUD) operations
+- Batch operations: edit/delete by type and subdomain
+- Configuration via environment variables or config file
+- Full SKILL.md documentation with examples
+
+### Features
+- **Ping**: Test API connection
+- **List domains**: View all domains with status and expiration
+- **Records**: Get all DNS records for a domain
+- **Create**: Add new DNS records with full control (type, name, content, TTL, priority)
+- **Edit**: Update records by ID or by type/subdomain
+- **Delete**: Remove records by ID or by type/subdomain
+- **Get**: Retrieve specific records with filtering by type and/or name
+
+### Documentation
+- Complete SKILL.md with API reference and usage examples
+- README.md with quick start guide
+- Inline tool help (`node porkbun-dns.js --help`)
+
+---
+
+## [Unreleased]
+
+### Planned
+- DNS record validation before submission
+- Bulk record import/export
+- DNSSEC management support
+- Zone file import/export
+- Webhook notifications for DNS changes
+- Rate limit handling
+
+---
+
+## Version Guidelines
+
+This project follows [Semantic Versioning](https://semver.org/):
+
+- **MAJOR** version: Incompatible API changes
+- **MINOR** version: Backwards-compatible functionality additions
+- **PATCH** version: Backwards-compatible bug fixes
+
+## Categories
+
+- **Added**: New features
+- **Changed**: Changes in existing functionality
+- **Deprecated**: Soon-to-be removed features
+- **Removed**: Removed features
+- **Fixed**: Bug fixes
+- **Security**: Security vulnerabilities