[kaffeindecaf]

Summary

• Invert the seam-removal displacement so salient content shrinks instead of expanding.
• Raise default seam scaling controls to their full range so the progressive effect is obvious; it still ramps from unchanged to a maximum 50% shrink per axis while preserving the output canvas.
• Add a synthetic salient-object regression and refresh the 120-frame benchmark/README values.

Verification

• Full test suite passes with optional dependencies installed.
• Rendered the supplied clip: face/content visibly shrinks by the end, output remains 2560x1440 with 377 frames and AAC audio.
• Start/mid/end source-to-output RGB differences: 0.94 / 13.24 / 20.78.