feat: add limb intrinsics for BigInt foundation#184
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Prepare infrastructure for arbitrary precision integer support: - Update tree-sitter-tribute to v0.4.2 (adds #(T, T) tuple type syntax) - Add I32/I64 types to resolver for low-level arithmetic - Create lib/std/runtime/limb.trb with limb intrinsics: - __limb_add: addition with carry - __limb_sub: subtraction with borrow - __limb_mul: wide multiplication (32×32 → 64) - __limb_div: wide division (64÷32 → 32) - __limb_cmp: unsigned comparison Note: wasm backend implementation pending. Also need to decide on Array type or builtin BigInt representation before full implementation. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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