feat: add CODEOWNERS file for automatic reviewer assignment

[Copilot]

Adds automatic reviewer assignment to improve PR review velocity and establish clear component ownership.

Changes

Created .github/CODEOWNERS with ownership patterns:

• Global default: * → @githubnext/gh-aw-firewall-maintainers
• Container security: /containers/
• CI/CD workflows: /.github/workflows/ and /scripts/ci/
• Documentation site: /docs-site/
• Core TypeScript: /src/
• Test infrastructure: /tests/
• Build configuration: package.json, tsconfig*.json

All patterns use team reference format and follow .gitignore syntax with last-match-wins precedence.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[plan] create codeowners file for automatic reviewer assignment</issue_title>
<issue_description>## Objective

Create a .github/CODEOWNERS file to automatically assign reviewers based on the files changed in a PR.

Context

Without CODEOWNERS:

• PRs may sit unreviewed, slowing down merge velocity
• No clear ownership of different components
• Manual reviewer assignment is error-prone

Approach

1. Create .github/CODEOWNERS file
2. Define ownership patterns:
   • Global default owners (all files)
   • Container security: /containers/
   • CI/CD workflows: /.github/workflows/
   • Documentation site: /docs-site/
   • Core TypeScript: /src/
3. Use team references (e.g., @githubnext/gh-aw-firewall-maintainers) or individual usernames

Files to Create

• Create: .github/CODEOWNERS

Acceptance Criteria

• .github/CODEOWNERS exists with ownership patterns for key directories
• File uses valid GitHub username or team syntax
• Ownership covers containers, workflows, docs, and core code
• Global fallback owners are defined

References

• GitHub CODEOWNERS docs: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
  Related to [plan] improve ci/cd pipeline and quality gates #348

AI generated by Plan Command for discussion #345

Comments on the Issue (you are @copilot in this section)

• Fixes [plan] create codeowners file for automatic reviewer assignment #350

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[Mossaka]

@copilot please merge origin/main