fix(input): restore launcher press and release impulses

The rewrite used a 375-millipixel impulse for both charging and release. The
reconstructed key handlers use the setup scalar 15: every repeated Down keydown
subtracts 15*50, and release subtracts a further 15*100 before clamping.

Use 750-millipixel press increments and the 1,500-millipixel release impulse,
then reproduce the randomized -3800 lower clamp and weak -2280 upper branch.
Derive the ten launcher decoration frames from the original strict multiples of
750 and keep integration/gravity assertions separate from the immediate release
state.

Test Plan:
- `cargo test --all-targets` -- passed, 60 tests
- `cargo clippy --all-targets -- -D warnings` -- passed
- `rumdl check tdkpin-rs/CHANGELOG.md tdkpin-rs/RECONSTRUCTION.md` -- passed
- `git diff --cached --check` -- passed

tdkpin-rs/CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to
 
 ### Fixed
 
+- Restore launcher input to the setup scalar: each Down keydown subtracts 750
+  millipixels, release subtracts 1,500, then applies the recovered `-3800` and
+  `-2280` clamp/jitter branches and the ten original decoration thresholds.
 - Apply the original independent `1.03 - Random * 0.08` X/Y velocity response
   after entering radius-bearing type-4 targets, preserving both motion and the
   subsequent shared PRNG sequence.