feat(quality): trial CodeRabbit alongside critic

.coderabbit.yaml

@@ -0,0 +1,30 @@
+language: en-US
+tone_instructions: Be direct and concise. Prioritize correctness, security, and runtime behavior.
+
+reviews:
+  profile: assertive
+  review_status: true
+  review_details: true
+  path_filters:
+    - "src/forge_loop/**"
+    - "!tests/**"
+  path_instructions:
+    - path: "src/forge_loop/**"
+      instructions: >-
+        Review forge-loop production code as a second-opinion correctness and
+        security reviewer. Focus on logic bugs, missing edge cases, unsafe I/O,
+        API contract drift, concurrency hazards, and Python idiom issues that
+        can change behavior. Do not leave generic style, naming, formatting,
+        docstring, import-order, or preference comments; Ruff and the
+        manifesto-aware critic own those findings.
+  tools:
+    ruff:
+      enabled: true
+    flake8:
+      enabled: false
+    pylint:
+      enabled: false
+    markdownlint:
+      enabled: false
+    languagetool:
+      enabled: false

docs/CONTRIBUTING.md

@@ -46,6 +46,16 @@ uv run pytest tests/ --cov=src/forge_loop --cov-fail-under=70
 4. Don't lower the coverage floor. If a refactor genuinely needs to, justify it in the PR body.
 5. Adversarial tests preferred — hunt the sad path, not the happy path.
 
+## Reviewers
+
+The manifesto-aware critic is the primary reviewer for forge-loop's style,
+architecture, testing discipline, and project-specific quality rules.
+CodeRabbit runs alongside it as a second-opinion reviewer for correctness,
+security, runtime behavior, and Python API-contract issues that the manifesto
+does not yet encode. When the two disagree, the manifesto wins on style and
+architecture; CodeRabbit wins on correctness unless the critic cites a
+documented manifesto rule.
+
 ## Architecture conventions
 
 - Single source of config: `forge_loop.settings.Settings`. No new `os.environ.get("LOOP_*")` outside `settings.py` — the `test_no_loop_env_reads_outside_settings` regression test enforces this.