fix: deterministic ORT session release (int8 OOM) - #149
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Six interleaved session lifetimes (3 precisions x parity+margins) plus the torch reference OOMed the 32GB container at the int8 stage; del + gc in a finally block instead of waiting on GC.
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The 2.1 parity crashed ~3min into the int8 stage twice; the zip itself decodes clean locally (20/20 pairs). Root cause: cumulative ORT arenas across the interleaved precision stages. Sessions now release in a finally block; parity tests green.