Ultimate Sleep

Makes the 1.3.0 catch-up observable. No behaviour change to the catch-up itself.

Added

- `progression start` / `progression end` log lines (INFO, once per catch-up, mod and plugin), mirroring the ACCELERATE start / ACCELERATE end pair the engine already logs: progression start: catching up 9847 ticks over ~10s / progression end: applied 9847 ticks over 197 server ticks (9.9s). An admin who changes progression_catchup_seconds can now see it take effect.

Why it exists

Building the catch-up smoketest gate proved the window has no external observable: the random-tick boost is applied and restored INSIDE a single tick body, so a console gamerule random_tick_speed query -- which can only run between ticks -- reads the world's own value every time, mid-catch-up included. Sampling it measures nothing, and a permissive parser turns that nothing into numbers. Crop growth is no better: it is stochastic, and a single wheat block needs ~7 successful random ticks, which one night of catch-up does not reliably deliver. So the only honest way to assert "the night was SPREAD, not applied in one tick" is for the mod to say so. The gate now measures the window from these two lines, and the same lines are what an operator reads on a live server.