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A cut position after the last column is legitimate — _crop_to_budget asks for min(start + budget, img.width), which equals the width whenever the remaining strip is shorter than the budget. find_blank_cut clamped target to width but then walked leftwards starting at target itself, so ink[width] raised IndexError. Caught on hardware: it killed the ledmatrix-stocks fetch, and because _fetch_plugin_content catches broadly that surfaced as the plugin silently contributing nothing for the cycle. Only reachable on the second or later pass of the rotating window over a single oversized image, which is why the existing tests missed it — they all exercised the first pass, where start is 0 and start + budget is comfortably inside the image. Added TestRotationAcrossMultipleCycles, which walks the window round several times and asserts content is never lost, plus direct coverage of find_blank_cut at and beyond the image edge. Both bounds now stop at width - 1 so neither direction can index past the end. Co-Authored-By: Claude <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KEZK1P1Q1fu5pcuVrkrCFZ