ci: add Claude Tier 0 baseline PR review caller

[williaby]

Summary

Adds the Tier 0 Claude baseline PR reviewer as a thin caller of the org reusable workflow in ByronWilliamsCPA/.github (for PRs to the template repo itself). Part of the org-wide tiered-pr-review rollout.

• 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).

The Claude GitHub App is installed org-wide and ANTHROPIC_API_KEY is an org secret (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.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: f0cc704e-cf73-4828-8fad-2cd5b0e9e874

📥 Commits

Reviewing files that changed from the base of the PR and between efcf21f and 3b90491.

📒 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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