fix: restore go compatibility for runtime models

internal/runtime/store.go

@@ -27,24 +27,16 @@ func (s Store) Snapshot() (Snapshot, error) {
 	}
 	stateExists := fileExists(statePath)
 	goalsExists := fileExists(goalsPath)
-	if !stateExists && !goalsExists {
-		return Snapshot{
-			Threads:    []Thread{},
-			SpawnEdges: []SpawnEdge{},
-			Goals:      []Goal{},
-			Source: SourceEvidence{
-				Kind:       "sqlite_missing",
-				Confidence: "low",
-				Message:    "Codex SQLite files were not found; returning an empty read-only snapshot.",
-			},
-		}, nil
+	sources := SourceMap{
+		"state": sqliteSource("state", statePath, stateExists),
+		"goals": sqliteSource("goals", goalsPath, goalsExists),
 	}
-
 	snapshot := Snapshot{
 		Threads:    []Thread{},
 		SpawnEdges: []SpawnEdge{},
 		Goals:      []Goal{},
-		Source:     SourceEvidence{Kind: "sqlite_readonly", Path: statePath, Confidence: "high"},
+		Source:     aggregateSource(sources),
+		Sources:    sources,
 	}
 	if stateExists {
 		db, err := openReadonlySQLite(statePath)
@@ -75,6 +67,38 @@ func (s Store) Snapshot() (Snapshot, error) {
 	return snapshot, nil
 }
 
+func sqliteSource(name string, path string, exists bool) SourceEvidence {
+	if exists {
+		return SourceEvidence{Kind: "sqlite_readonly", Path: path, Confidence: "high"}
+	}
+	return SourceEvidence{
+		Kind:       "sqlite_missing",
+		Path:       path,
+		Confidence: "low",
+		Message:    name + " SQLite file was not found; returning empty data for that source.",
+	}
+}
+
+func aggregateSource(sources SourceMap) SourceEvidence {
+	state := sources["state"]
+	goals := sources["goals"]
+	if state.Kind == "sqlite_readonly" && goals.Kind == "sqlite_readonly" {
+		return SourceEvidence{Kind: "sqlite_readonly", Confidence: "high"}
+	}
+	if state.Kind == "sqlite_missing" && goals.Kind == "sqlite_missing" {
+		return SourceEvidence{
+			Kind:       "sqlite_missing",
+			Confidence: "low",
+			Message:    "Codex SQLite files were not found; returning an empty read-only snapshot.",
+		}
+	}
+	return SourceEvidence{
+		Kind:       "sqlite_partial",
+		Confidence: "partial",
+		Message:    "One Codex SQLite source is missing; available data was read from existing sources only.",
+	}
+}
+
 func openReadonlySQLite(path string) (*sql.DB, error) {
 	uri := url.URL{Scheme: "file", Path: path}
 	query := uri.Query()