Wait and both kinds of until loops; blocks run directly

Script runs are resumable threads saved with the game; Rhai is gone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Cargo.toml

@@ -6,7 +6,6 @@ license = "MIT"
 
 [dependencies]
 macroquad = { version = "0.4" }
-rhai = { version = "1.27.0", default-features = false, features = ["std", "no_time"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"