fix(omnivoice): sync vendored diarizer reader to IFGO + fail-closed epoch guard

[lalalune]

Summary

• flips the vendored voice_diarizer.c LSTM gate unpack from raw ONNX IOFC to the converter's IFGO packing, matching packages/native/plugins/voice-classifier-cpp on elizaOS/eliza develop (post fix(voice): reject stale diarizer GGUF gate order eliza#11569)
• ports the #11569 fail-closed guard into the vendored copy: voice_diarizer_open now requires explicit voice_diarizer.converter_epoch >= 2 and lstm_gate_order == "IFGO"; epoch-less legacy artifacts (the previously published IOFC bake, sha 30983eba…) and explicit non-IFGO artifacts are rejected loudly before tensor load instead of silently scrambling gates into the DER 1.000 signature
• builds on the metadata parsing + test infrastructure merged in fix(omnivoice): reject explicit diarizer gate-order skew #40, extending the contract test to the fail-closed semantics: epoch-2 IFGO clears the guard (reaches the missing-tensor stage, proven via stderr capture); explicit IOFC, epoch-less, and epoch-1 artifacts each rejected with the exact guard message

Sequencing (elizaOS/eliza#11377)

This is step 1 of the coordinated cutover. Merging this alone is safe for the repo but a fused lib built from it will (correctly, loudly) refuse the currently published IOFC artifact — the eliza-side PR bumps the submodule pin and the manifest to a freshly published epoch-2 IFGO artifact in the same change.

Validation

• cmake -B build-11377 -S . -DLLAMA_BUILD_OMNIVOICE=ON -DLLAMA_BUILD_TESTS=OFF -DLLAMA_BUILD_TOOLS=ON -DBUILD_TESTING=ON
• cmake --build build-11377 --target omnivoice-test-diarizer-metadata -j
• ./build-11377/bin/omnivoice-test-diarizer-metadata → omnivoice diarizer metadata failures=0
• git diff --check clean
• Real-artifact verification (fused libelizainference.dylib built from this branch, speakeriso:real DER + guard rejection of the published 30983eba artifact) lands in the eliza-side PR evidence bundle.

🤖 Generated with Claude Code

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