docs: document MSRV support policy in README#146
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The MSRV section listed only the current version (1.85) with no statement of how far behind stable we track or when it gets raised. Document the policy: no more than ~12 months behind latest stable (evaluated at each release, defaulting to the ~1-year-old stable for maximum downstream compatibility), raised earlier only when a valuable dependency or language feature requires it and never beyond current stable, with each bump treated as a minor 0.x release.
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aknott-ant
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Summary
Documents buffa's MSRV support policy in the README's "Minimum supported Rust version" section. Previously the section listed only the current version (1.85) with no statement of how far behind stable we track or when it gets raised.
The policy: MSRV is kept no more than ~12 months behind the latest stable Rust, evaluated when each release is cut — defaulting to the stable that was current ~1 year earlier (maximizing downstream compatibility), raised ahead of schedule only when a valuable dependency or language feature requires it, and never beyond current stable. An MSRV bump is treated as a minor (0.x) release and noted in the CHANGELOG.
Docs-only; the MSRV value (1.85) is unchanged.