Behavior-preserving enhancements and Waves extensions

1. ENH-1201Todo
   Every extension declares whether it is invisible to strict results or requires enhanced mode.→
2. ENH-1202Todo
   Behavior-preserving optimizations produce identical strict traces, render lists, network PDUs, and errors.→
3. ENH-1203Todo
   Caching, parsing, layout, transport, and startup optimizations improve measured performance without changing strict observable outcomes.→
4. ENH-1204Todo
   Diagnostics expose strict state without becoming a semantic dependency or changing timing/order.→
5. ENH-1205Todo
   Modern UX can wrap the emulator while keypad, softkey, focus, deck, and network mechanics remain strict inside the emulation boundary.→

Exit contract

Evidence required to leave this sprint

• Every extension is registered and mode-scoped.
• Strict differential tests pass.
• Enhancements cannot satisfy or waive a strict conformance obligation.