chore: refine codeowners routing

[kristinapathak]

TL;DR

Add back team-based CODEOWNERS routing for major NVCF ownership areas while retaining @NVIDIA/nvcf-dev as the fallback and @NVIDIA/nvcf-admin ownership of .github/CODEOWNERS.

Additional Details (optional for docs, build, test, refactor, ci, chore, style, and revert PRs)

• Routes control-plane and invocation-plane service paths to @NVIDIA/nvcf-control-plane-dev, including former invocation, SIS, and Stargate ownership.
• Routes compute-plane paths and NVCA-related charts/stack ownership to @NVIDIA/nvcf-compute-plane-dev.
• Routes Cassandra, NATS, and OpenBao infrastructure paths to @NVIDIA/nvcf-infra-dev.
• Routes GitHub workflows, ci, and tools paths to @NVIDIA/nvcf-ci-dev.
• Routes docs/ to @NVIDIA/nvcf-docs-dev.
• Some subgroup teams may be created after this file lands; the CODEOWNERS entries capture the intended routing.

For the Reviewer

Please review the .github/CODEOWNERS grouping and rule ordering.

For QA (optional for docs, build, test, refactor, ci, chore, style, and revert PRs)

Validation:

• git diff --check
• local CODEOWNERS path existence check

Is QA Needed? No, CODEOWNERS-only metadata change.

Issues

Closes #364

Checklist

• I am familiar with the Contributing Guidelines.
• I have signed off my commits for Developer Certificate of Origin (DCO) compliance.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

Summary by CodeRabbit

• Chores
  • Improved repository ownership and review routing across workflows, documentation, infrastructure, and service components.
  • Added clearer guidance for maintaining ownership rules and fallback coverage.
  • No end-user-facing functionality or behavior changes.

[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: Enterprise

Run ID: b7a3fd0e-a6ad-4988-8632-db7f2d11c21a

📥 Commits

Reviewing files that changed from the base of the PR and between 97a4611 and 6e5de79.

📒 Files selected for processing (1)

• .github/CODEOWNERS

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📝 Walkthrough

Walkthrough

The CODEOWNERS file now documents rule precedence and fallback behavior, preserves existing owners, and adds explicit ownership routing for CI/tools, documentation, infrastructure, control-plane, and compute-plane paths.

Changes

CODEOWNERS routing

Layer / File(s)	Summary
Ownership policy and fallbacks .github/CODEOWNERS	Documents last-match precedence and fallback behavior while retaining repository and CODEOWNERS-file ownership.
Area-specific ownership routing .github/CODEOWNERS	Routes CI/tools, documentation, infrastructure, control-plane, and compute-plane paths to their respective teams.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The Conventional Commits chore prefix matches this CODEOWNERS-only routing update and accurately describes the change.
Linked Issues check	✅ Passed	The CODEOWNERS rules keep the fallback owner and admin ownership while routing control, compute, infra, CI/tools, and docs paths as requested.
Out of Scope Changes check	✅ Passed	The diff is limited to .github/CODEOWNERS plus related ordering comments, which stays within the routing update scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/fine-grained-codeowners

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