feat: ImplementAndJudge chain, per-tool error reporting, and minimum-diff judge rubric #635

Job	Run time
check	51s
release-validate	12s
nix-test (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/pythinker)	1m 49s
nix-test (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/pythinker)	1m 25s
build (windows-2025-vs2026, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe, true)	4m 24s
test (3.14)	9m 5s
build (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/onefile/pythinker)	3m 1s
build (macos-14, aarch64-apple-darwin, dist/onefile/pythinker)	2m 2s
build (windows-2022, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe)	3m 45s
nix-test (macos-14, aarch64-apple-darwin, dist/pythinker)	4m 1s
build (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/onefile/pythinker)	2m 19s
test (3.12)	10m 26s
test (3.13)	9m 47s
	53m 7s

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