Phase 1: Rust/PyO3 acceleration for `SnakemakeFormatter.parse()` - #533

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copilot/implement-phase-1-rust-migration

Commits on Feb 28, 2026

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Phase 1 Rust (PyO3) migration for SnakemakeFormatter.parse()

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Address code review: improve surrogate fallback comment and Rust Option sentinel comment

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Rewrite Rust parser as a clean character-by-character state machine

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Simplify Rust tuple API and add _core.pyi stub

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benchmarks
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