ci: add on-demand Claude review of in-flight PRs
.github/workflows/claude-review.yml runs the project's own two-axis
review skill (.pi/skills/review/SKILL.md) against a PR via
anthropics/claude-code-action@v1. Invoked two ways: a '/review' comment
on the PR (owner/member/collaborator only) or a workflow dispatch with a
PR number. The prompt pins the skill's bindings for CI — merge-base as
the fixed point, PR body as the spec — and the report lands as a
top-level PR comment plus inline comments. Read-only on contents;
allowedTools limited to gh/git read commands and comment posting.
Requires the ANTHROPIC_API_KEY repo secret, not yet configured.
SYSTEMS_MAP.md: add .github/workflows/ to the Layout tree (omitted at
creation) and record the new GitHub-invocable seam on the process layer.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>