feat: add target repo examples and file layout guidance

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

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+# Harness Health
+
+- project map clarity: partial
+- validation commands: partial
+- fast feedback: weak
+- task templates: partial
+- guardrails: partial
+- doc-code alignment: partial
+
+## Top priorities
+1. Define repo-standard lint and test wrappers
+2. Document service dependencies for integration tests
+3. Clarify package ownership boundaries