chore: route reviews to maintainer team

[TabishB]

What changed

• route repository-wide code ownership to @Fission-AI/openspec-maintainers
• add Clay Good to the documented core maintainers

Why

Review requests currently route only to Tabish. The new visible maintainer team has Maintain access to OpenSpec and is configured to auto-assign one reviewer using load balancing.

Impact

Once merged, new ready-for-review pull requests will route to an available maintainer instead of always requesting Tabish. The existing one-approval policy remains unchanged.

Validation

• git diff --check
• verified the team is visible
• verified the team has Maintain repository access
• verified auto-assignment is enabled for one load-balanced reviewer

Summary by CodeRabbit

• Documentation
  • Updated the project’s core maintainer listing to include Clay Good.
• Chores
  • Updated repository code ownership defaults to reflect the current maintainers.

[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 Plus

Run ID: a6c80abd-762c-48a6-b02c-28a67a2dd437

📥 Commits

Reviewing files that changed from the base of the PR and between 22533a4 and c947037.

📒 Files selected for processing (1)

• MAINTAINERS.md

🚧 Files skipped from review as they are similar to previous changes (1)

• MAINTAINERS.md

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📝 Walkthrough

Walkthrough

Repository governance metadata is updated by changing the default code owner and adding Clay Good to the Core Maintainers table.

Changes

Repository governance

Layer / File(s)	Summary
Ownership and maintainer records .github/CODEOWNERS, MAINTAINERS.md	The default code owner is changed to the maintainers team, and Clay Good is added as a Core Maintainer.

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

Possibly related PRs

• Fission-AI/OpenSpec#495: Introduces the maintainer documentation and lists core maintainers.

Suggested reviewers: clay-good

🚥 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 title clearly reflects routing reviews to the maintainer team, which is the main code ownership change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/maintainer-approvals

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[alfred-openspec]

Reviewed the CODEOWNERS and maintainer-list updates, including the automation-maintainer entry. All required checks are green.