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The native-vs-downscale decision in InvisibleEngine.remove_watermark (the issue #10/#15 fix: max_resolution=0 must not pre-downscale, since any downscale both loses quality and lets SynthID survive) had no test. Extract it into a pure helper invisible_engine._target_size(w, h, max_resolution) and cover it with tests/test_invisible_engine.py::TestTargetSize so a re-introduced forced downscale fails CI instead of silently regressing #15. Also: - Clamp the short side to >=1 in _target_size: extreme aspect ratios (e.g. 5000x3 with --max-resolution 1024) truncated it to 0 and crashed image.resize(). Pre-existing in the inline math; fixed now that it is a named, tested function. - Consolidate the two duplicated temp-file save blocks into one unconditional save (behavior unchanged: the EXIF-transposed image is still always persisted before WatermarkRemover reloads it by path), and drop the now-redundant `_tmp_path is not None` guard in finally. - Bump version 0.5.3 -> 0.5.4 (pyproject, __init__, uv.lock); document the helper as the regression guard in CLAUDE.md. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>