fix(fused-ffi): complete ABI v9 context_size + bump stale sizeof assert (80→88)

[lalalune]

The streaming-LLM config struct eliza_llm_stream_config_t gained context_size (int32 @ offset 80) for ABI v9 — eliza_inference_llm_stream_open now honors cfg->context_size (>0) instead of only the ELIZA_LLM_N_CTX env default. The TS marshaller (ffi-bindings.ts) was already emitting 88 bytes with context_size at offset 80, but the C-side ABI-guard static_assert(sizeof(...) == 80) was never bumped — so the fused elizainference target fails to compile. This bumps it to 88 to match the real layout.

Validated: a host Metal build of libelizainference (ABI v12) loads + generates on the real google/gemma-4-E2B with context_size=4096 honored — "The capital of France is Paris.", 83 tok/s on an Apple M4 Max.

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