fix(voice): diarizer IFGO cutover — fork reader sync pin + epoch-2 artifact republish (#11377)

[lalalune]

Summary

Closes #11377 (diarizer DER 1.000 on the speakeriso:real bench).

The rebake-confirm evidence on the issue proved the DER-1.000 over-segmentation signature is pure LSTM gate-order skew between diarizer GGUF artifact and reader — the fork's vendored fused reader was still IOFC while the packages-side converter/reader moved to IFGO (+ the #11569 fail-closed epoch guard). This PR executes the corrected operator plan in the safe order:

1. Fork reader sync (already merged fork-side): fix(omnivoice): reject explicit diarizer gate-order skew llama.cpp#40 (diarizer epoch/gate-order metadata parsing + contract test) then fix(omnivoice): sync vendored diarizer reader to IFGO + fail-closed epoch guard llama.cpp#41 (IFGO gate-unpack flip + the fix(voice): reject stale diarizer GGUF gate order #11569 fail-closed guard ported into the vendored voice_diarizer.c: converter_epoch >= 2 and lstm_gate_order == "IFGO" required, epoch-less/IOFC artifacts rejected loudly before tensor load).
2. Epoch-2 IFGO artifact republished to HF elizaos/eliza-1 as a NEW file voice/diarizer/pyannote-segmentation-3.0-ifgo-epoch2.gguf (sha 100a5dbf…, bit-identical to the rebake-confirm session's deterministic bake; HF commit a89e5615). The old pyannote-segmentation-3.0.gguf (30983eba…) stays published so older fused libs keep working. voice/diarizer/SHA256SUMS added additively.
3. This PR: submodule gitlink bump 58c0391eb → dda200ab0 (a direct descendant — the On-device local LLM crash-loops on iPhone 16 Pro Max (A18 Pro): NULL Metal pipeline in ggml mul_mat during llama_decode #11612 Metal nil-pipeline/has_bfloat fixes are retained), diarizer 0.3.0 entry in VOICE_MODEL_VERSIONS, epoch-2 filename preferred in the workbench/attribution-smoke probe lists, evidence bundle.

Evidence (all real runs on M4 Max — .github/issue-evidence/11377-diarizer-ifgo-cutover/)

lane	result
IFGO lib × epoch-2 bake	DER 0.211, attribution 6/6 (margin 0.818), overlap probe localSpeakerCount=2 — PASS (was 1.000 in the skewed pairing)
IFGO lib × published IOFC 30983eba	rejected loudly: stale GGUF converter epoch 0; need >= 2 with LSTM gates packed as IFGO → typed VoiceLifecycleError, bench exit 1 — no silent scramble
kokoro smoke	audio identical to baseline-pin lib (envelope-cv 1.229, 91800 samples); TTFA >700 ms budget fails on the baseline pin lib too (4876 ms) — pre-existing cold-load issue, not a regression; the fork diff touches zero Kokoro code
asr smoke	PASS — real transcript in 861 ms over Metal
fork contract test	omnivoice-test-diarizer-metadata → failures=0 (epoch-2 IFGO clears guard to tensor stage; explicit IOFC / epoch-less / epoch-1 rejected with exact messages, stderr-captured)

Verification

• bun run verify → exit 0 (full repo, local)
• packages/shared voice-models tests 15/15; plugin-local-inference voice-models-routes + voice-model-updater 43/43
• Rebased onto origin/develop (13f8727) pre-open

Test evidence rows

• Real-LLM trajectories: N/A — no agent/action/prompt/model-routing behavior change; the change is a native voice-classifier reader + artifact pin.
• Video/screenshots: N/A — no UI surface; bench logs + JSON reports attached in the evidence bundle.
• Backend logs: attached (bench + guard rejection logs in the evidence bundle).
• Domain artifacts: HF commit a89e5615 (new GGUF + SHA256SUMS), round-trip sha verified.

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