Harden gateway recovery diagnostics and media delivery.\n\n- Accept gateway send asVoice and map it to outbound audioAsVoice.\n- Preserve generated Swift protocol models for the gateway send schema.\n- Keep the broader recovery hardening for install/update/status/vector/TTS paths in one reviewed PR.\n\nProof:\n- Focused local gateway/outbound/update/status/doctor/sqlite-vec tests passed.\n- oxfmt --check and git diff --check passed.\n- Testbox OPENCLAW_TESTBOX=1 pnpm check:changed passed at 2f5ef650e97763a61ff43c28e61707db84c50060.\n- GitHub required checks are green at the merge SHA; the qa-lab parity gate is optional/surface-only and was still pending.
