Update repository setup and agent guidance

[robo38]

Summary

• Added repository governance and AI assistant instruction files.
• Added GitHub code ownership metadata.
• Added a Git hook entrypoint for local repository checks.
• Updated GitHub Copilot guidance.
• Updated root ignore/package configuration.

Changed Areas

• Repository documentation and assistant guidance.
• GitHub ownership and Copilot configuration.
• Root Git hooks and ignore rules.
• Root package metadata/scripts.

Files Included

• .githooks/pre-commit
• .github/CODEOWNERS
• .github/copilot-instructions.md
• .gitignore
• AGENTS.md
• AGENTS_SETTINGS.md
• CLAUDE.md
• GEMINI.md
• package.json

Testing

• Not run; this commit only updates root repository setup/configuration files.

Notes

• Existing apps/ source changes are not part of this PR.
• PowerShell may print a local oh-my-posh profile warning; it is unrelated to the repository changes.