Promoting the measured 2052..2088 menu window in the TD2 SDL port

Promoting the measured 2052..2088 menu window in the TD2 SDL port This checkpoint closes a useful gap in the SDL runtime: the menu_gameplay_entry rail no longer jumps from a handful of sampled post-2050 anchors. It now carries the exact measured baseline window from frames 2052..2088, and the default-rival A lane replays that same window with measured state mutations instead of guessed interpolation. The practical change is in the scheduler and mutator surface. The runtime now loads every measured baseline frame in that bounded window from scheduler_rail_contracts.jsonc, and the A route mutator applies the traced state_09a2/state_09a8/state_137c plus dp_0020/dp_0022/dp_0053/dp_0054 values for the same corridor. That makes the menu rail much harder to drift silently: it is no longer “five anchors and some hope”, it is a concrete measured sequence. The probe data justified that promotion. Inside 2054..2088, the no-input lane is stable enough to treat as exact contract data, while the A l