MarCCD::CanRead and SMV::CanRead read the first plausible file of a
directory outside their own try, and the CLI made all three CanRead
calls outside the try that reports a bad input. "rugnux <dir>" whose
alphabetically-first plausible file is unreadable therefore terminated
with no message. CanRead now answers false for anything it cannot read,
and the CLI asks the question where it can report the answer.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013nW6FNRP1bBJJ8pfHiByAT
leonarski_fandClaude Opus 5
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