feat(autograder): shared grader_lib + 8 hygiene checks from c55 reviews#4

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feat/autograder-improvements

Commits on May 22, 2026

feat(autograder): add shared grader_lib + code hygiene warnings
Lasse Benninga
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fix(grader_lib): use if-then instead of [[]] && to avoid set -e exit
Lasse Benninga
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fix(grader_lib): all check_* functions always return 0 (safe under set -e)
Lasse Benninga
committed