Preserve null collections in effective YAML

docs/roadmap/remediation.md

@@ -128,7 +128,13 @@ valid overlay remains accepted.
 
 ## 4. Preserve null versus empty collections in effective YAML
 
-Status: Open — P2
+Status: Resolved — P2
+
+Resolution: Effective YAML is now emitted from the credential-safe JSON value
+projection through an output-only YAML-node conversion. Explicit nulls, empty maps,
+empty slices, booleans, strings, and exact JSON numbers retain their semantic types.
+Public show/diff tests cover null and empty maps and slices, while digest,
+credential-redaction, deterministic output, and exact-integer coverage remain intact.
 
 **Evidence:** `internal/config/effective_pipeline.go:154` marshals the typed
 projection directly with `yaml.Marshal`. The encoder emits nil slices as `[]`