fix(physics): restore fixed-point rail movement

Replace the guessed variable-rate floating integration with the original 10 ms
millipixel step, 15-unit gravity, and 3800-unit speed limit. Restore every
registered type-2 Real48 response pair, one-sided start-to-end orientation, and
the original normal/tangent velocity transform validated against live shooter
wall traces.

Restore repeat-driven plunger charging and its release-time randomized clamp.
The shooter route now follows table orientation instead of coordinate-specific
gate exceptions. Remove the synthetic ball-search impulse so future stuck balls
remain visible reconstruction failures, and include collision ids in deterministic
traces for differential work on circles and triggers.

Test Plan:
- `cargo test --all-targets` -- 42 passed
- `cargo clippy --all-targets -- -D warnings` -- passed
- `cargo build --profile production` -- passed
- charged launcher scenario cleared the shooter lane -- passed
- all recovered rails accepted front-side and rejected back-side probes
- `git diff --cached --check` -- passed

tdkpin-rs/src/app.rs

@@ -209,9 +209,8 @@ impl App {
     }
 
     fn play_event(&self, event: Event) {
-        if let Some(id) = event.sound_resource() {
-            self.assets.play(id, self.saved.settings.sounds);
-        }
+        self.assets
+            .play(event.sound_resource(), self.saved.settings.sounds);
     }
 
     fn finish_game(&mut self) {