feat: add target repo examples and file layout guidance

examples/node-project/ai/harness-health.md

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+# Harness Health
+
+- project map clarity: partial
+- validation commands: strong
+- fast feedback: partial
+- task templates: partial
+- guardrails: strong
+- doc-code alignment: partial
+
+## Top priorities
+1. Add a faster unit-test-only command
+2. Document generated-code boundaries more clearly
+3. Keep AGENTS.md aligned with actual routes and services