nx_pitch_gate.nx

nx_pitch_gate.nx -- REFEREE for VOICE-CLONE-001 rung 0 (sovereign F0). POSITIVE (voiced, real-ish): nx_voiced_vowel.wav is a glottal pitch glide 120 -> 100 Hz @ 8 kHz. The detector MUST (a) report ~120 Hz in an early window and ~100 Hz in a late window, (b) TRACK the downward glide (early_f0 > late_f0), and (c) flag both windows VOICED. NEG-CONTROL #1 (synthetic): a deterministic white-noise buffer MUST read UNVOICED. If noise reads voiced the detector is worthless -> RED. NEG-CONTROL #2 (real data): nx_speech_mixed.wav is voiced->unvoiced->voiced. The middle (unvoiced) third MUST read UNVOICED while the outer thirds read VOICED -- a discrimination the synthetic noise control can't give. Every measured value is PRINTED (no fabricated greens). Evidence -> stdout + knowledge/status/pitch_gate.log. Exit 0 GREEN / 1 RED. Sovereign: nx_syscalls + nx_pitch only. license_tier: ORIGINAL