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chore: bump toolchain to v4.31.0 - #166

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bump-toolchain-v4.31.0
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chore: bump toolchain to v4.31.0#166
kim-em wants to merge 1 commit into
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bump-toolchain-v4.31.0

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@kim-em

@kim-em kim-em commented Aug 26, 2026

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This PR bumps the Lean toolchain from v4.23.0 to v4.31.0 and refreshes the Lake manifest.

This stops short of the current release, v4.33.1. NNG4's GameServer dependency comes from leanprover-community/lean4game, whose server/lean-toolchain is still v4.31.0 on main and which has no tag past v4.31.0; leanVersion in the lakefile resolves the mathlib and GameServer requirements from the toolchain, so the game cannot move ahead of the server. Going to v4.33.1 also runs into a Lake API change (Dependency.version? is now version) that only matters once the server can follow.

🤖 Prepared with Claude Code

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01C4AZKZ85yyEVqQby5CeBiR
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