test(main): pin set_shard_or_exit's --shard spec validation#824
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First unit tests for src/main.sh. --shard's slice arithmetic depends on this validation; pin the boundaries the acceptance tests don't reach: index==total and 1/1 accepted; index 0, total 0, missing slash, empty/partial specs, and negative/decorated numbers all rejected. Invalid specs exit the shell, so every call runs in a subshell.
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🤔 Background
--shard's slice arithmetic depends onset_shard_or_exit's validation; acceptance tests cover two invalid specs but none of the boundaries.💡 Changes
src/main.sh:4/4and1/1accepted (off-by-one guards), index/total zero, missing slash, empty/partial specs, negative/decorated numbers rejected.