feat: add live progress streaming to init/reinit tools

- InitOptions.onProgress callback for directory-level progress
- generateDirectoryMap reports per-file progress (→ filename)
- initProject reports [N/M] Analyzing <path> (X files)...
- pi-extension wires _onUpdate to onProgress for live Pi UI updates
- User sees real-time feedback instead of silent long waits

src/init.ts

@@ -16,6 +16,7 @@ export interface InitOptions {
 	verbose?: boolean;
 	llmClient?: LLMClient;
 	cacheDir?: string;
+	onProgress?: (message: string) => void;
 }
 
 export async function initProject(
@@ -23,11 +24,15 @@ export async function initProject(
 	options: InitOptions = {},
 ): Promise<void> {
 	const entries = discoverProject(rootPath);
+	options.onProgress?.(`Scanning ${entries.length} directories...`);
 
-	for (const entry of entries) {
-		await generateDirectoryMap(entry, options.llmClient, options.cacheDir);
+	for (let i = 0; i < entries.length; i++) {
+		const entry = entries[i];
+		options.onProgress?.(`[${i + 1}/${entries.length}] Analyzing ${entry.relativePath} (${entry.files.length} files)...`);
+		await generateDirectoryMap(entry, options.llmClient, options.cacheDir, options.onProgress);
 	}
 
+	options.onProgress?.(`Generated ${entries.length} .pi-map.md files`);
 	if (options.verbose !== false) {
 		console.log(`Generated ${entries.length} .pi-map.md files`);
 	}
@@ -37,12 +42,14 @@ export async function generateDirectoryMap(
 	entry: DirectoryEntry,
 	llmClient?: LLMClient,
 	cacheDir?: string,
+	onProgress?: (message: string) => void,
 ): Promise<FileEntry[]> {
 	// Process files in parallel (4 concurrent) with retry logic
 	const fileData = await processFiles(
 		entry.files,
 		async (file) => {
 			const filePath = join(entry.dirPath, file);
+			onProgress?.(`  → ${file}`);
 			const llmData = await extractFileLLM(filePath, llmClient, cacheDir);
 			const astData = await extractFileAST(filePath);
 			return mergeFileData(file, llmData, astData);