Fix active follow-ups and parameter responsiveness

[SmartAI]

Summary

• Deliver messages sent during an active run through pi steering while preserving FIFO order, attachments, pending controls, cancellation, and recovery.
• Verify that every exposed CAD parameter changes executed geometry and report ineffective parameters through the verification gate.
• Persist parameter edits before publishing local geometry so failed durable writes keep the last valid model intact.
• Add deterministic browser coverage for same-run follow-ups and real pointer-driven canvas changes.

Testing

• npm run typecheck
• npm test - 456 client, 158 server, and 2 shared tests passed
• py-tests/.venv/bin/pytest py-tests - 168 passed
• Follow-up steering Playwright E2E
• Parameter pointer drag, rollback, replay, and canvas pixel Playwright E2E
• npm run build