feat: add target repo examples and file layout guidance

examples/node-project/ai/project-map.md

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+# Project Map
+
+## Entry points
+- `src/index.ts` — app bootstrap
+- `src/routes/` — route registration
+
+## Main layers
+- routes -> services -> db
+- shared utilities live under `src/lib/`
+
+## Notes
+- Integration tests may require a local database service
+- Some generated types may exist under `src/generated/`; avoid editing them directly unless asked