* fix(vosk): refuse to load a model that would exceed available memory
vosk.Model() allocates the whole model in one spike during loading,
including the RNNLM rescoring component some models ship, with no way
to check the requirement up front or load incrementally. Walk the
model directory, compare its on-disk size against psutil's available
memory with a 1.5x margin, and raise before calling into the native
loader instead of letting the kernel OOM killer take the process down
mid-load.
Fixes#676
* fix(vosk): match memory safety margin to the documented peak
greptile flagged the guard's own comment: loading can spike to ~2x the
model's on-disk size, but the margin only required 1.5x available memory,
so a load between those two multiples could still trigger the OOM this
guard exists to prevent.
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Co-authored-by: Jatin K Malik <jatinkrmalik@gmail.com>
