feat: add target repo examples and file layout guidance

examples/go-project/AGENTS.md

@@ -0,0 +1,26 @@
+# AGENTS.md
+
+## Project overview
+This repository is a Go backend service with HTTP endpoints and background jobs.
+
+## Important directories
+- `cmd/server/` — main server entrypoint
+- `internal/api/` — HTTP layer
+- `internal/service/` — business logic
+- `internal/store/` — persistence
+- `internal/jobs/` — background jobs
+- `tests/` — integration tests
+
+## Commands
+- test: `go test ./...`
+- build: `go build ./...`
+- lint: `golangci-lint run`
+
+## Working rules
+- Prefer minimal diffs
+- Avoid touching generated code unless requested
+- Do not change schema or migrations unless requested
+- Identify whether tests need external services before running them
+
+## Additional harness files
+See `ai/project-map.md`, `ai/task-templates.md`, and `ai/risk-guardrails.md`.