fix: retarget updater to @mosaic/mosaic (#384)

packages/mosaic/src/commands/launch.ts

@@ -7,9 +7,9 @@
 
 import { execFileSync, execSync, spawnSync } from 'node:child_process';
 import { existsSync, mkdirSync, readFileSync, writeFileSync, readdirSync, rmSync } from 'node:fs';
+import { createRequire } from 'node:module';
 import { homedir } from 'node:os';
 import { join, dirname } from 'node:path';
-import { fileURLToPath } from 'node:url';
 import type { Command } from 'commander';
 
 const MOSAIC_HOME = process.env['MOSAIC_HOME'] ?? join(homedir(), '.config', 'mosaic');
@@ -498,10 +498,14 @@ function delegateToScript(scriptPath: string, args: string[], env?: Record<strin
  * CLI version) over the deployed copy in ~/.config/mosaic/ (may be stale).
  */
 function resolveTool(...segments: string[]): string {
-  // Resolve relative to the built file: dist/commands/launch.js → ../../framework/tools/...
-  const thisFile = fileURLToPath(import.meta.url);
-  const bundled = join(dirname(thisFile), '..', '..', 'framework', 'tools', ...segments);
-  if (existsSync(bundled)) return bundled;
+  try {
+    const req = createRequire(import.meta.url);
+    const mosaicPkg = dirname(req.resolve('@mosaic/mosaic/package.json'));
+    const bundled = join(mosaicPkg, 'framework', 'tools', ...segments);
+    if (existsSync(bundled)) return bundled;
+  } catch {
+    // Fall through to deployed copy
+  }
   return join(MOSAIC_HOME, 'tools', ...segments);
 }