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This PR raises Beam’s minimum supported Lean release to 4.33, limits exact CI validation to the latest stable point of each supported line, and uses Lake’s native module pre-setup trace for saves. Projects on Lean 4.31–4.32 must upgrade Lean or retain an older Beam checkout. - Validate Lean 4.33.1, 4.34.1, and 4.35.0 on Linux and macOS; remove RC and superseded-point CI jobs and prebuild only those three toolchains with --all-validated. Other canonical RC and patch variants remain eligible for local qualification. - Remove the pre-4.33 save trace and output branches. Internal module-save requests require the IR signature path, and saves use Lake’s canonical signature path and native trace. - Require save/replay checks to verify the signature artifact and descriptor. Reject late source edits with contentModified while preserving prior artifacts and trace. - Guard the stable-only CI matrix, one validated point per supported line, and inclusion of the repository default. Retain the pinned nightly’s optional C output descriptor as the only remaining Lean save compatibility shim.
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This PR raises Beam’s minimum supported Lean release to 4.33, limits exact CI validation to the latest stable point of each supported line, and uses Lake’s native module pre-setup trace for saves. Projects on Lean 4.31–4.32 must upgrade Lean or retain an older Beam checkout.