https://gitlab.synchro.net/main/sbbs/-/commit/386601b6bbf1fd47c5c32529
Modified Files:
src/ssh/test/test_auth.c test_conn.c
Log Message:
Add 5 auth password-change and conn demux edge case tests

Auth server password change flow:
- passwd_change_cb returns FAILURE (USERAUTH_FAILURE sent)
- no passwd_change_cb set when change=true (falls through to FAILURE)

Connection demux edge cases:
- WINDOW_ADJUST from peer (covers WINDOW_ADJUST case + window_add)
- CHANNEL_DATA after EOF (data discarded per eof_received guard)
- Truncated CHANNEL_DATA (payload_len < 9, silently dropped)

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

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