chore: prepare repo for transfer to useblocks org

[patdhlk]

Summary

Prepares the Pharaoh repository for transfer from patdhlk/pharaoh to useblocks/pharaoh.

• Update ownership references in LICENSE, plugin.json, marketplace.json (patdhlk → useblocks)
• Add community health files: SECURITY.md, CHANGELOG.md
• Add GitHub issue templates (bug report, feature request) and PR template
• Update CONTRIBUTING.md with org context, DCO sign-off, template references
• Add CI workflow: validates skill/agent frontmatter, cross-references, internal links
• Add release workflow: tag-triggered GitHub Release with zip artifact

Details

No changes to skills, agents, or prompt logic. Pure infrastructure and governance.

• CODE_OF_CONDUCT.md intentionally omitted (inherited from useblocks/.github org repo)
• CI is dependency-free (shell-based validation, no Python/Node install)
• Uses latest GitHub Actions: actions/checkout@v6, softprops/action-gh-release@v2
• Post-merge manual step: git remote set-url origin git@github.com:useblocks/pharaoh.git

Test plan

• Verify grep -r "patdhlk" returns only the intentional LICENSE attribution
• Verify CI workflow YAML is valid
• Verify release workflow YAML is valid
• Verify issue templates render correctly on GitHub
• Verify PR template renders correctly on GitHub

[gemini-code-assist]

Code Review

This pull request transitions the project ownership to useblocks, updates metadata across plugin configuration files, and establishes standard repository documentation. Key additions include a security policy for the pure-prompt architecture, a changelog for version 0.1.0, and templates for issues and pull requests. Feedback was provided regarding broken relative links to issue templates in the contribution guide, which should be updated to absolute paths to function correctly on GitHub.

[gemini-code-assist]

The relative links to the issue templates are currently broken. When viewing this file on GitHub, a link like ?template=... will simply append the query string to the current file's URL instead of navigating to the repository's issue creation page. Since the repository is being transferred to the useblocks organization, it is recommended to use absolute paths to ensure these links work correctly from both the repository root and the file view.

Suggested change

	- **[Bug Report](?template=bug_report.md)** -- for problems with skills or agents
	- **[Feature Request](?template=feature_request.md)** -- for improvements or new capabilities
	- **[Bug Report](/useblocks/pharaoh/issues/new?template=bug_report.md)** -- for problems with skills or agents
	- **[Feature Request](/useblocks/pharaoh/issues/new?template=feature_request.md)** -- for improvements or new capabilities