feat: add progress bar to init/reinit with per-file tracking

- processFiles() now accepts onProgress callback (completed, total, currentFile)
- InitOptions.onProgress receives structured ProgressInfo object
- initProject aggregates progress across all directories
- CLI renders ASCII progress bar: [████░░░░░░] 3/20 | filename.ts
- Pi extension sends structured updates with percentage + file details
- All 52 tests passing

src/cli/cli.ts

@@ -63,6 +63,14 @@ function formatCount(count: number, label: string): string {
 	return `${pc.bold(String(count))} ${count === 1 ? label : plural}`;
 }
 
+function renderProgressBar(completed: number, total: number, currentFile?: string, width = 30): string {
+	const pct = total > 0 ? completed / total : 0;
+	const filled = Math.round(width * pct);
+	const bar = "█".repeat(filled) + "░".repeat(width - filled);
+	const file = currentFile ? ` | ${pc.dim(currentFile)}` : "";
+	return `[${pc.cyan(bar)}] ${completed}/${total}${file}`;
+}
+
 function parseArgs(args: string[]): {
 	path: string;
 	fix: boolean;
@@ -128,7 +136,18 @@ async function main() {
 			const entries = discoverProject(targetPath);
 			console.log(`Scanning ${formatCount(entries.length, "directory")}...`);
 			const client = createClientFromArgs(parsed);
-			await initProject(targetPath, { verbose: false, llmClient: client, cacheDir: targetPath });
+			let lastLine = "";
+			await initProject(targetPath, {
+				verbose: false,
+				llmClient: client,
+				cacheDir: targetPath,
+				onProgress: (info) => {
+					const line = renderProgressBar(info.completed, info.total, info.currentFile);
+					process.stdout.write("\r" + line.padEnd(lastLine.length));
+					lastLine = line;
+				},
+			});
+			process.stdout.write("\n");
 			const elapsed = ((Date.now() - start) / 1000).toFixed(1);
 			console.log(
 				`${pc.green("✓")} Generated ${formatCount(entries.length, ".pi-map.md file")} in ${elapsed}s`,
@@ -179,7 +198,18 @@ async function main() {
 				`Regenerating ${formatCount(entries.length, ".pi-map.md file")}...`,
 			);
 			const client = createClientFromArgs(parsed);
-			await reinitPath(targetPath, { verbose: false, llmClient: client, cacheDir: targetPath });
+			let lastLine = "";
+			await reinitPath(targetPath, {
+				verbose: false,
+				llmClient: client,
+				cacheDir: targetPath,
+				onProgress: (info) => {
+					const line = renderProgressBar(info.completed, info.total, info.currentFile);
+					process.stdout.write("\r" + line.padEnd(lastLine.length));
+					lastLine = line;
+				},
+			});
+			process.stdout.write("\n");
 			const elapsed = ((Date.now() - start) / 1000).toFixed(1);
 			console.log(`${pc.green("✓")} Regenerated in ${elapsed}s`);
 			break;