fix: clean reinstall to generate CI-compatible lockfile

Complete clean reinstall to resolve ERR_PNPM_LOCKFILE_CONFIG_MISMATCH.
Removed node_modules and regenerated lockfile from scratch to ensure
full compatibility with CI frozen-lockfile requirements.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: jonphipps