ffmpeg-0004 (MOAD-0004 / CWE-312): libavformat/http.c http_connect() logs the full
HTTP request at AV_LOG_DEBUG, including the Authorization: Basic header with
base64-encoded user:pass. Fix: produce a sanitized copy before av_log, replacing
auth header values with ***REDACTED***. Wire bytes unchanged. 22/22 unit tests PASS.
FFmpeg MOADs 0002/0003/0005: CLEAN. ImageMagick MOADs 0002-0005: CLEAN.
