feat: render ASCII progress bar in Pi extension updates

- Add renderProgressBar() helper in pi-extension.ts
- Pi init/reinit now show [████░░░░░░] 3/20 → filename.ts
- Replaces plain text percentage with visual bar
- All 52 tests passing

pi-extension.ts

@@ -55,6 +55,14 @@ function isDirty(content: string): boolean {
 	return content.includes("## dirty") && !content.includes("## dirty\n-");
 }
 
+function renderProgressBar(completed: number, total: number, currentFile?: string, width = 20): string {
+	const pct = total > 0 ? completed / total : 0;
+	const filled = Math.round(width * pct);
+	const bar = "█".repeat(filled) + "░".repeat(width - filled);
+	const file = currentFile ? ` → ${currentFile}` : "";
+	return `[${bar}] ${completed}/${total}${file}`;
+}
+
 export default function (pi: ExtensionAPI) {
 	pi.registerTool({
 		name: "project_map_init",
@@ -83,10 +91,10 @@ export default function (pi: ExtensionAPI) {
 					llmClient: client,
 					cacheDir: ctx.cwd,
 					onProgress: (info) => {
-						const pct = info.total > 0 ? Math.round((info.completed / info.total) * 100) : 0;
+						const bar = renderProgressBar(info.completed, info.total, info.currentFile);
 						_onUpdate?.({
-							content: [{ type: "text", text: `${info.message} (${pct}%)` }],
+							content: [{ type: "text", text: bar }],
-							details: { progress: pct, file: info.currentFile, dir: info.dir },
+							details: { progress: info.total > 0 ? Math.round((info.completed / info.total) * 100) : 0, file: info.currentFile, dir: info.dir },
 						});
 					},
 				});
@@ -215,10 +223,10 @@ export default function (pi: ExtensionAPI) {
 					llmClient: client,
 					cacheDir: ctx.cwd,
 					onProgress: (info) => {
-						const pct = info.total > 0 ? Math.round((info.completed / info.total) * 100) : 0;
+						const bar = renderProgressBar(info.completed, info.total, info.currentFile);
 						_onUpdate?.({
-							content: [{ type: "text", text: `${info.message} (${pct}%)` }],
+							content: [{ type: "text", text: bar }],
-							details: { progress: pct, file: info.currentFile, dir: info.dir },
+							details: { progress: info.total > 0 ? Math.round((info.completed / info.total) * 100) : 0, file: info.currentFile, dir: info.dir },
 						});
 					},
 				});