Implement layered maps and context retrieval

src/index.ts

@@ -1,5 +1,25 @@
 // Main entry point for pi-project-map skill
-export { initProject, reinitPath } from "./init.js";
-export { patchFile } from "./patch.js";
-export { validateMaps } from "./validate.js";
-export { renderPackageMap, parsePackageMap } from "./format.js";
+export { initProject, reinitPath, generateDirectoryArtifacts } from "./init.js";
+export { patchFile, type PatchMode, type PatchOptions } from "./patch.js";
+export {
+	validateMaps,
+	type ValidationOptions,
+	type ValidationResult,
+	type Discrepancy,
+} from "./validate.js";
+export {
+	renderPackageMap,
+	parsePackageMap,
+	renderDirectoryMap,
+	parseDirectoryMap,
+	renderDirectoryIndex,
+	parseDirectoryIndex,
+} from "./format.js";
+export type { PackageMapData } from "./format.js";
+export {
+	createDirectoryModel,
+	type DirectoryArtifactModel,
+	type FileEntry,
+} from "./directory-model.js";
+export { populateRoutingMetadata } from "./routing-metadata.js";
+export { retrieveContext } from "./retrieve.js";