Expose resolution input provenance

resolution.go

@@ -15,6 +15,7 @@ type resolutionState struct {
 	schema      *schemaDescriptor
 	presence    map[string]inputPresence
 	document    *document.Node
+	input       resolutionInput
 	records     map[string]*resolutionRecord
 	diagnostics []Diagnostic
 }
@@ -50,6 +51,27 @@ func (r *Resolution) IsExplicit(path Path) bool {
 	return explicit
 }
 
+// InputInfo returns detached entry-state metadata for path. The entry state is
+// the decoded configuration, including retained static defaults, immediately
+// before resolution starts. It is fixed while resolution records mutate the
+// working configuration; unknown or shape-mismatched paths return false.
+//
+// InputInfo is valid only during the resolution callback. See the configuration
+// contract for source and provenance semantics.
+func (r *Resolution) InputInfo(path Path) (FieldInfo, bool) {
+	return r.activeState().input.lookup(path)
+}
+
+// Source returns a detached record for a source acquired by this load. Empty or
+// unknown IDs return false and do not perform input, filesystem, or credential
+// access. A source path is present only when that acquired source has one.
+//
+// Source is valid only during the resolution callback. See the configuration
+// contract for source and provenance semantics.
+func (r *Resolution) Source(id string) (SourceInfo, bool) {
+	return r.activeState().input.source(id)
+}
+
 // Record declares the intent for a resolver mutation. A container path covers
 // mutations to its descendants.
 func (r *Resolution) Record(path Path, kind ChangeKind, reason string, dependencies ...Path) {
@@ -221,9 +243,10 @@ func (state *resolutionState) addDiagnostic(code Code, path Path, message string
 	state.diagnostics = append(state.diagnostics, diagnostic)
 }
 
-func runResolution[T any](configuration *T, resolver func(*T, *Resolution) error, schema *schemaDescriptor, decoded decodedConfiguration, input *document.Node) resolutionResult {
+func runResolution[T any](configuration *T, resolver func(*T, *Resolution) error, schema *schemaDescriptor, decoded decodedConfiguration, input *document.Node, entry resolutionInput) resolutionResult {
 	state := &resolutionState{
 		active: true, schema: schema, presence: decoded.presence, document: input,
+		input:   entry,
 		records: make(map[string]*resolutionRecord),
 	}
 	context := &Resolution{state: state}