Drops @fusion/pi-claude-cli from runtime dependencies so
`pnpm install -g @runfusion/fusion` no longer 404s on the unpublishable
private workspace package. The pi extension is staged into
dist/pi-claude-cli/ at build time and resolved relative to the running
module, with the workspace require.resolve preserved as a dev fallback.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>