feat(opt): ægraph i64 ops + 8 new identity rules + commutativity helpers (v1.1.0 Track C)#137
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…ers (v1.1.0 Track C, rebased) Track C's content rebased onto post-Track-B main. Track B's cost-driven extract is preserved (it's already merged on main as PR #134); this PR adds i64 op variants + 8 i64 identity rules + commutativity helpers on top. ## What lands 11 new Op variants: I64Add/Sub/Mul/And/Or/Xor/Shl/ShrS/ShrU/Eq/Eqz. 8 new identity rules (i64 add/or/and/mul/xor + 3 shift-by-zero). Op::is_commutative() + EGraph::canonicalize_commutative() helpers. ## Tests 25 egraph tests pass (was 18 after Track B). 1 ignored (commutativity end-to-end — needs insertion-time normalization, v1.1.1). Trace: REQ-3
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Rebased version of the v1.1.0 Track C agent's work onto post-Track-B main.
25 egraph tests pass. 1 ignored (commutativity end-to-end, v1.1.1 follow-up — needs insertion-time normalization).
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