v0.11.2

fix: stop silent passthrough when visible finds no known mark

Previously, visible --mark auto (or an explicit --mark with detection on) exited 0 without writing output when no registered mark was found. A wrapping service reads that as success and re-serves the unchanged image. Since ~74% of real uploads carry no registered visible mark, this was the dominant "it didn't work" failure.

Now the command:

• runs a cheap metadata-only identify,
• prints actionable guidance (route to all for an invisible/metadata watermark, or erase --region for an arbitrary logo),
• writes no output file,
• exits EXIT_NO_VISIBLE_MARK (2), distinct from success (0) and a hard error (1), so a caller can surface the message instead of treating the unchanged image as done.

Same handling for an explicit --mark <name> that is not detected. --no-detect still forces the gemini fallback and proceeds (exit 0).

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