feat: OP_LEN_HAS_K_COUNT peephole closes bio canonical perf gate#368
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Peephole-fuses 'len (flt has-K-pred xs)' to a single VM opcode that walks the list doing haystack.contains() per element in tight Rust. Eliminates ~165M opcode dispatches in the bio canonical hot loop. Predicate-body inliner extended to accept 2-word ops so the fast path itself inlines into outer flt loops. Files: src/vm/mod.rs (op + matcher + dispatcher + inliner), src/vm/jit_cranelift.rs + src/vm/compile_cranelift.rs (numeric-output), examples/len-flt-has-k-count.ilo, tests/regression_len_flt_has_k_count.rs
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Closes the parked bio canonical 5.6s perf gate via a peephole-fused opcode. Predicted ~7s reduction in the bio hot loop.