docs: ADR Danger vs CodeRabbit-only

Closes #66

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: ulises-jeremias

docs/adr/0002-pr-automation.md

@@ -0,0 +1,13 @@
+# ADR 0002: PR automation — CodeRabbit-only (no Danger.js)
+
+## Decision
+
+Do **not** port `tools/danger` from create-node-app for CPA v0.
+
+Rely on GitHub Actions PR validation + CodeRabbit (when enabled) for review comments.
+
+## Rationale
+
+- Smaller Python monorepo; Actions already cover lint/test/typecheck
+- Avoid maintaining a JS Danger toolchain in a Python repo
+- Can revisit if review automation gaps appear