feat: bootstrap he maintainer skill

he-maintainer/references/go.md

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+# Go Harness Notes
+
+Use this reference for Go repositories.
+
+## Common files to inspect
+
+- `go.mod`
+- `go.sum`
+- `cmd/`
+- `internal/`
+- `pkg/`
+- `Makefile`
+- `.golangci.*`
+
+## Common validation commands
+
+Typical examples:
+
+- `go test ./...`
+- `go build ./...`
+- `golangci-lint run`
+- `make test`
+- `make build`
+
+Prefer repo-defined commands when available.
+
+## Common guardrails
+
+- avoid broad package churn when a local fix is enough
+- identify whether generated code exists before editing
+- note whether integration tests require external services
+- keep command examples copy-pasteable