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

pi-extension.ts

@@ -78,7 +78,12 @@ export default function (pi: ExtensionAPI) {
 			try {
 				const targetPath = params.path || ctx.cwd;
 				const client = getPiLLMClient(ctx);
-				await initProject(targetPath, { verbose: false, llmClient: client, cacheDir: ctx.cwd });
+				await initProject(targetPath, {
+					verbose: false,
+					llmClient: client,
+					cacheDir: ctx.cwd,
+					onProgress: (msg) => _onUpdate?.({ content: [{ type: "text", text: msg }] }),
+				});
 				return {
 					content: [
 						{
@@ -199,7 +204,12 @@ export default function (pi: ExtensionAPI) {
 			try {
 				const targetPath = params.path || ctx.cwd;
 				const client = getPiLLMClient(ctx);
-				await reinitPath(targetPath, { verbose: false, llmClient: client, cacheDir: ctx.cwd });
+				await reinitPath(targetPath, {
+					verbose: false,
+					llmClient: client,
+					cacheDir: ctx.cwd,
+					onProgress: (msg) => _onUpdate?.({ content: [{ type: "text", text: msg }] }),
+				});
 				return {
 					content: [
 						{