ci: add Claude Tier 0 baseline PR review caller

[williaby]

Summary

Adds the Tier 0 Claude baseline PR reviewer to this repo as a thin caller of the org reusable workflow in ByronWilliamsCPA/.github. Part of the org-wide tiered-pr-review rollout (the reviewer already runs on .github, .claude, and homelab-infra).

The caller follows the hardened pattern proven by the eval cohort:

• Pinned to a reachable .github main SHA (8de6560); Renovate-tracked.
• Explicit ANTHROPIC_API_KEY mapping (least-privilege), not secrets: inherit.
• No caller-level concurrency block (the reusable owns concurrency; a caller block would deadlock at startup).
• Per-repo repo-description / sensitive-paths / escalation-guidance.

The Claude GitHub App is installed org-wide, and ANTHROPIC_API_KEY is an org secret with visibility: all, so no per-repo setup is required.

Verification

This PR adds the reviewer's own workflow file, so the action's tamper guard will skip the actual review on this PR; the signal is that the run reaches a job (skip) rather than a zero-job startup failure. Normal PRs will be reviewed.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 2203aa3e-d71f-494a-bec8-78e47eb06152

📥 Commits

Reviewing files that changed from the base of the PR and between e3ea1fc and 784f972.

📒 Files selected for processing (2)

• .github/workflows/claude-baseline-review.yml
• CHANGELOG.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/baseline-review-rollout

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!