fix: regenerate pnpm-lock.yaml with picomatch override

After adding pnpm.overrides for picomatch in #86, the lockfile still
referenced the old resolution, causing pnpm install in CI to fail with
ERR_PNPM_LOCKFILE_CONFIG_MISMATCH. Regenerate the lockfile so it
matches the override.

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

Author: JohnMcLear