chore: add CODEOWNERS for sensitive path review enforcement

[mrizzi]

Summary

• Add CODEOWNERS file at repo root mapping sensitive paths to required reviewers
• Plugin manifest paths (plugins/sdlc-workflow/.claude-plugin/, .claude-plugin/marketplace.json) require Maintainer/Owner review
• Core methodology (docs/methodology.md) and governance (CONTRIBUTING.md) require Owner review
• Uses GitHub usernames (@mrizzi) — to be replaced with team references when org teams are created

Implements TC-5080

Summary by Sourcery

Chores:

• Introduce a root CODEOWNERS file mapping plugin manifests, methodology docs, and governance docs to required reviewers.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a root-level CODEOWNERS file to enforce review by specific maintainers/owners for sensitive paths related to plugins, methodology, and governance documents.

File-Level Changes

Change	Details	Files
Introduce CODEOWNERS-based review enforcement for sensitive plugin, methodology, and governance paths.	Add a root-level CODEOWNERS file to the repository. Configure plugin manifest paths to require Maintainer/Owner review via CODEOWNERS entries. Configure core methodology and governance documentation paths to require Owner review via CODEOWNERS entries. Use specific GitHub usernames in CODEOWNERS as temporary owners, to be replaced with team references later.	CODEOWNERS

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[mrizzi]

Verification Report for TC-5080 (commit c98eb8c)

Check	Result	Details
Review Feedback	N/A	No substantive review feedback on this PR
Root-Cause Investigation	N/A	No sub-tasks created — nothing to investigate
Scope Containment	PASS	PR touches exactly CODEOWNERS — matches task spec
Diff Size	PASS	1 file, 12 lines added — proportionate
Commit Traceability	PASS	Both commits reference TC-5080
Sensitive Patterns	PASS	No secrets or credentials detected
CI Status	PASS	All 3 checks pass (Plugin Validation, Skill Lint, Sourcery)
Acceptance Criteria	PASS	6 of 6 criteria met
Test Quality	N/A	No test files in PR; Eval Quality: N/A
Test Change Classification	N/A	No test files in PR
Verification Commands	N/A	No verification commands specified

Overall: PASS

All checks pass. CONTRIBUTING.md does not exist yet (expected from sibling task) — the CODEOWNERS rule is syntactically valid and will activate when the file is created.

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This comment was AI-generated by sdlc-workflow/verify-pr v0.12.2.