Add blanket docs-team CODEOWNERS rule (DOC-2496)

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What

Adds the blanket docs-team CODEOWNERS rule (* @redpanda-data/documentation) for DOC-2496, the on-call docs PR review pipeline. This file is inert until branch protection enables "require review from Code Owners" — that flip is a separate, announced step (repo admins; see the rollout guide in docs-team-standards .github/DOCS_REVIEW_ROLLOUT.md).

Once protection is enabled, a docs-team approval becomes the merge gate here — that's the pipeline's merge-authority model (design decision 7: the automated docs-review status stays informational; only the CODEOWNERS approval physically gates).

Part of DOC-2496; pipeline PRs: redpanda-data/docs-team-standards#2912, redpanda-data/docs-extensions-and-macros#303.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Essentials

Run ID: fa3d878b-1371-4276-b678-93e5cb27683d

📥 Commits

Reviewing files that changed from the base of the PR and between 97eceb0 and 8bbf65d.

📒 Files selected for processing (1)

• .github/CODEOWNERS

Included review availability: 3 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour.

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📝 Walkthrough

Walkthrough

The CODEOWNERS file now includes a global * rule that assigns all paths to the documentation team. Comments explain the rule's branch-protection purpose. Existing path-specific rules retain precedence.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 8bbf6

This change assigns the documentation team as the default code owner while preserving more specific ownership rules. No current merge-readiness risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a blanket documentation-team CODEOWNERS rule.
Description check	✅ Passed	The description directly explains the CODEOWNERS change, its relationship to DOC-2496, and its branch-protection dependency.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch doc-2496-codeowners

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