fix: make python -m tabcmd work reliably (#375)#411

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jac/fix-375-python-m-tabcmd

Commits on Jul 2, 2026

fix: ensure sys.exit(1) on import failure in __main__.py, call main() unconditionally

jacalata
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claude
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fix: restore __name__ guard, fix stderr routing, strengthen tests in __main__.py

jacalata
and
claude
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fix: broaden except clause, improve error message, harden import-error test

jacalata
and
claude
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