ClayGrounds v0.2.5 — TamaCrafti-Style Build Rewrite

- Replaced the stalled v0.2.4 scheduled/force-load dispatcher with the same persistent scoreboard-clock pattern used by the uploaded TamaCrafti home builder.
- 374 visual build steps, matching TamaCrafti's house step count.
- Two steps every three game ticks: approximately 2x TamaCrafti's build cadence.
- Approximately 28 seconds of active construction after a ~2.15 second world/view-distance settle period.
- Every step persists in #build_step, so save/reload resumes rather than restarting.
- Existing ClayGrounds terrain geometry, fountain fix, progression anchors, combat, and model IDs are preserved.
- The 2,892 existing authoring commands are grouped into 7-8-command visual steps instead of 64 heavy world cells.
- Water placement is deferred until terrain is present and uses replace-air to reduce progressive fluid interference.
- Player camera remains free while movement is held at the arrival platform.
- Bossbar/actionbar countdown is tied directly to real build-step completion.
- Removed recurring generation scheduling and the 3x3 per-cell force-load workflow.
