chore: add CODEOWNERS for automated PR review routing

[cv]

Summary

• Adds .github/CODEOWNERS to auto-assign reviewers by file path
• Routes CLI/scripts/CI/infra changes to @NVIDIA/nemoclaw-maintainer
• Routes docs/tests/onboarding to @NVIDIA/nemoclaw-engineer
• Routes policy files and Dockerfile to @NVIDIA/nemoclaw-security
• GitHub round-robins within each team to spread review load

Context

The open PR queue has grown steadily, with 88% stuck at REVIEW_REQUIRED. This file ensures every PR gets routed to the right team automatically.

Note

For full enforcement, the org-level ruleset on main should have "Require review from Code Owners" enabled. Without that flag, any team member can approve regardless of path ownership.

Test plan

• Verify CODEOWNERS syntax is valid (GitHub will show a warning banner on the file if not)
• Open a test PR touching docs/ and confirm nemoclaw-engineer is auto-assigned
• Open a test PR touching nemoclaw/src/ and confirm nemoclaw-maintainer is auto-assigned

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated repository governance configuration for pull request reviewer assignment.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 69969c97-67ce-4ec8-8058-0e19f72b7755

📥 Commits

Reviewing files that changed from the base of the PR and between 5748a32 and 8e9f201.

📒 Files selected for processing (1)

• .github/CODEOWNERS

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📝 Walkthrough

Walkthrough

A .github/CODEOWNERS file is added to define code ownership rules across the repository. It establishes default ownership and path-specific assignments for CLI plugins, blueprints, policies, scripts, containers, documentation, tests, and configuration directories.

Changes

Cohort / File(s)	Summary
GitHub Configuration .github/CODEOWNERS	New file establishing code ownership rules with fallback team assignment and path-specific ownership mappings for CLI, blueprints, security policies, scripts, containers, documentation, tests, and repository configuration.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 The warren grows and ownership is clear,
With paths and rules for those held dear,
Each team now knows what's in their care,
No confusion in the maintainer's lair! 🏘️

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'chore: add CODEOWNERS for automated PR review routing' clearly and concisely summarizes the main change—adding a CODEOWNERS file for automated PR review assignment.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-codeowners-v2

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