Pi skill integration, CLI polish, --fix flag, config file support

- SKILL.md: Proper Agent Skills frontmatter with name/description
- pi-extension.ts: Pi extension registering 4 custom tools
  (project_map_init/patch/validate/reinit) with prompt snippets/guidelines
- pi-extension.ts: Auto-detects .pi-map.md files on session start, warns
  about dirty markers, injects maintenance hints before agent start
- package.json: Added pi.extensions and pi.skills entries
- CLI: Added picocolors, clean help screen, progress indicators,
  summary output with timing, colored check/warning icons
- validate.ts: Added --fix flag that regenerates directories with
  discrepancies
- config.ts: Reads .pi-project-map.json from project root with merge
  over defaults
- init.ts: Added optional verbose parameter for programmatic use

All 16 tests pass. TypeScript compiles clean. Build succeeds.

src/init.ts

@@ -10,14 +10,19 @@ import { mergeFileData } from "./merge.js";
 import { writeFileSync } from "fs";
 import { join } from "path";
 
-export async function initProject(rootPath: string): Promise<void> {
+export async function initProject(
+	rootPath: string,
+	options?: { verbose?: boolean },
+): Promise<void> {
 	const entries = discoverProject(rootPath);
 
 	for (const entry of entries) {
 		await generateDirectoryMap(entry);
 	}
 
-	console.log(`Generated ${entries.length} .pi-map.md files`);
+	if (options?.verbose !== false) {
+		console.log(`Generated ${entries.length} .pi-map.md files`);
+	}
 }
 
 export async function generateDirectoryMap(
@@ -46,7 +51,10 @@ export async function generateDirectoryMap(
 	return fileData;
 }
 
-export async function reinitPath(path: string): Promise<void> {
+export async function reinitPath(
+	path: string,
+	options?: { verbose?: boolean },
+): Promise<void> {
 	// Full regeneration clears all dirty markers by overwriting every .pi-map.md
-	await initProject(path);
+	await initProject(path, options);
 }