fix: add PNPM_HOME/bin to PATH for pnpm v11

pnpm v11 moved global binaries from PNPM_HOME to PNPM_HOME/bin.
Add the new bin subdirectory to PATH so that pnpm's global bin
directory check passes. This is backwards compatible — the extra
PATH entry is harmless for older pnpm versions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/install-pnpm/run.ts

@@ -44,6 +44,7 @@ export async function runSelfInstaller(inputs: Inputs): Promise<number> {
   if (exitCode === 0) {
     const pnpmHome = path.join(dest, 'node_modules/.bin')
     addPath(pnpmHome)
+    addPath(path.join(pnpmHome, 'bin'))
     exportVariable('PNPM_HOME', pnpmHome)
   }
   return exitCode