feat: add target repo examples and file layout guidance

examples/node-project/AGENTS.md

@@ -0,0 +1,28 @@
+# AGENTS.md
+
+## Project overview
+This repository is a Node.js + TypeScript service for handling billing and subscription events.
+
+## Important directories
+- `src/routes/` — HTTP handlers
+- `src/services/` — business logic
+- `src/db/` — database access
+- `tests/` — unit and integration tests
+- `scripts/` — development and maintenance scripts
+
+## Commands
+- install: `pnpm install`
+- test: `pnpm test`
+- lint: `pnpm lint`
+- typecheck: `pnpm tsc --noEmit`
+- build: `pnpm build`
+
+## Working rules
+- Prefer minimal diffs
+- Do not change database schema unless explicitly requested
+- Do not upgrade dependencies unless explicitly requested
+- Add or update tests for behavior changes
+- Prefer targeted validation first, then broader validation if needed
+
+## Additional harness files
+See `ai/project-map.md`, `ai/task-templates.md`, and `ai/risk-guardrails.md`.