Slate v2 Slate DOM Proof Closure

Goal

Close the slate-dom package lane on its actual narrow claim instead of pretending the old broad DOMEditor namespace is still the target.

Completed

• verified the package-level claim stays:
  • DOMBridge
  • ClipboardBridge
  • supporting DOM/clipboard types
• ran the package's direct proof suite:
  • bridge proof
  • clipboard boundary proof
• synced the True Slate RC proof ledger and release file review ledger
• made the remaining old DOMEditor depth explicit better-cut territory for now:
  • Android-only helper internals
  • legacy internal maps
  • future runtime optimization work

Verification

• yarn workspace slate-dom test
• yarn lint:typescript