https://gitlab.synchro.net/main/sbbs/-/commit/bdb23b7bc4371e2091228cfa
Modified Files:
src/ssh/ssh-chan.c
Log Message:
Guard bytebuf_read against division by zero on capacity==0

Same pattern as bytebuf_write fix Ä early return if the ring
buffer has zero capacity. All other division/modulo operations
in the library use compile-time constants or function returns
that are clamped to minimum values.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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