Create Metagraph Type.Module with Config, BaseNode, BaseEdge entries

Add src/graphs/modules/metagraph.ts exporting Metagraph as Type.Module()
with Config (Union defaults for type, Boolean defaults for multi/allowSelfLoops),
BaseNode (optional created/modified/metadata with Type.Unknown()), and
BaseEdge (type string, optional metadata with Type.Unknown()). Also export
GRAPH_STATUS const and GraphStatus TypeBox schema for sqlite host usage.
Update mod.ts to re-export from modules/metagraph.ts.

src/graphs/mod.ts

@@ -1,2 +1,7 @@
 export * from "./types.ts";
 export * from "./schemaBuilder.ts";
+export {
+  Metagraph,
+  GRAPH_STATUS,
+  GraphStatus,
+} from "./modules/metagraph.ts";

src/graphs/modules/metagraph.ts

@@ -0,0 +1,37 @@
+import { Type } from "@alkdev/typebox";
+
+export const Metagraph = Type.Module({
+  Config: Type.Object({
+    type: Type.Union([
+      Type.Literal("directed"),
+      Type.Literal("undirected"),
+      Type.Literal("mixed"),
+    ], { default: "mixed" }),
+    multi: Type.Boolean({ default: true }),
+    allowSelfLoops: Type.Boolean({ default: true }),
+  }),
+
+  BaseNode: Type.Object({
+    created: Type.Optional(Type.String({ format: "date-time" })),
+    modified: Type.Optional(Type.String({ format: "date-time" })),
+    metadata: Type.Optional(Type.Record(Type.String(), Type.Unknown())),
+  }),
+
+  BaseEdge: Type.Object({
+    type: Type.String(),
+    metadata: Type.Optional(Type.Record(Type.String(), Type.Unknown())),
+  }),
+});
+
+export const GRAPH_STATUS = {
+  Active: "active",
+  Archived: "archived",
+  Draft: "draft",
+} as const;
+
+export type GraphStatus = (typeof GRAPH_STATUS)[keyof typeof GRAPH_STATUS];
+export const GraphStatus = Type.Union([
+  Type.Literal(GRAPH_STATUS.Active),
+  Type.Literal(GRAPH_STATUS.Archived),
+  Type.Literal(GRAPH_STATUS.Draft),
+]);