chore(msrv): pin rust-version 1.85 + add MSRV lane to rust-ci#76
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Closes #57. Cargo.toml uses `edition = "2024"` which stabilised in Rust 1.85, but no MSRV was recorded. Pin `rust-version = "1.85"` and add a CI matrix lane on that exact toolchain alongside `stable`, so MSRV breakage shows up as a check failure instead of as a downstream user surprise. The check job (clippy + fmt) stays on `stable` only — those tools are allowed to evolve faster than the MSRV gate. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
Per V-L3-K1: declare MSRV and gate it in CI.
Cargo.toml:rust-version = "1.85"(matchesedition = "2024"stabilisation)rust-ci.yml: test job now runs as a matrix on[1.85, stable]. MSRV breakage shows as a check failure instead of as a downstream user surprise.checkjob (clippy/fmt) stays onstable— those tools evolve faster than the MSRV gate.Closes
Test plan
Cargo test (1.85)andCargo test (stable), both greenCargo.tomlhasrust-version = 1.85