Per SDD-106 §6 add a permission-state clamp to TransmitModeSelector.
When RECORD_AUDIO is Denied or PermanentlyDenied the transmit gate
is forced false regardless of PTT or voice-activity state; on
Granted the clamp releases and normal transmit decisions resume.
The clamp takes precedence over PTT and hard_mute in the decision
ordering documented inline.
Three new tests cover the clamp behavior, the release-on-grant
transition, and the non-RECORD_AUDIO ignore path.
Trace: SDD-106 §6, SRS-209.
EdisonJwa
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