[autoresearch] baseline: system prompt quality tests (5/5 passing)

.agents/skills/guardrails/languages/go.md

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+# Go Self-Review Checklist
+
+> **Load this file** after completing the universal self-review in `SKILL.md`, when the code under review is Go.
+
+---
+
+## Resource Cleanup
+
+- [ ] **No bare `defer X.Close()`** — all deferred closers use error-checked closures with `slog`
+- [ ] **No `//nolint:errcheck`** directives anywhere in new code
+- [ ] **Transaction rollbacks** check for `sql.ErrTxDone` before logging
+- [ ] **HTTP response bodies** are drained (`io.Copy(io.Discard, ...)`) before closing
+
+### Correct Patterns
+
+```go
+// ✅ Row/statement/connection Close
+defer func() {
+    if err := rows.Close(); err != nil {
+        slog.Warn("failed to close rows", "error", err, "operation", "<operation>")
+    }
+}()
+
+// ✅ Transaction Rollback
+defer func() {
+    if err := tx.Rollback(); err != nil && !errors.Is(err, sql.ErrTxDone) {
+        slog.Error("failed to rollback transaction", "error", err, "operation", "<operation>")
+    }
+}()
+
+// ✅ HTTP Response Body
+defer func() {
+    if _, err := io.Copy(io.Discard, resp.Body); err != nil {
+        slog.Warn("failed to drain response body", "error", err)
+    }
+    if err := resp.Body.Close(); err != nil {
+        slog.Warn("failed to close response body", "error", err)
+    }
+}()
+```
+
+---
+
+## Logging
+
+- [ ] **No `fmt.Printf` / `fmt.Println` / `log.Printf`** — only `slog` in production code
+- [ ] All log calls use **structured key-value pairs** (no `fmt.Sprintf` inside log messages)
+- [ ] Error logs include `"error", err` as a key-value pair
+
+---
+
+## Error Handling
+
+- [ ] All errors are wrapped with context using `%w`: `fmt.Errorf("doing X: %w", err)`
+- [ ] No duplicate wrapping of the same error
+- [ ] Sentinel errors used for expected conditions (`ErrNotFound`, `ErrUnauthorized`)
+
+---
+
+## Static Analysis
+
+- [ ] `go vet ./...` passes with zero issues
+- [ ] No new `//nolint:` directives without a `// NOLINT:` rationale comment
+- [ ] `//nolint:errcheck` specifically is **never** used — handle the error instead
+
+---
+
+## References
+- Go Idioms and Patterns @go-idioms-and-patterns.md (§ Idiomatic Patterns, § Formatting and Static Analysis)
+- Logging and Observability Principles @logging-and-observability-principles.md (§ Go/slog)
+- Error Handling Principles @error-handling-principles.md (§ Resource Cleanup)