feat: code-grader plain-text fallback + workspace env preflight#1209

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christso wants to merge 6 commits intomainfrom

feat/1207-1208-shell-grader-preflight

Commits on May 2, 2026

feat: add shell grader and workspace env preflight checks (#1207, #1208)

christso
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claude
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fix: resolve lint errors in shell grader and targets-validator imports

christso
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claude
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Commits on May 3, 2026

refactor: replace shell grader with code-grader plain-text fallback (#1210)

christso
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claude
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style: fix biome formatting in code-grader

christso
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claude
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Commits on May 4, 2026