fix(game): restore effect-seven multiball spawn

Use the exact record 148 spawn point and the reconstructed 0.8 * 3800 millipixel velocity for ball slot two. This removes the guessed shooter-lane launch and keeps the multiball lifecycle tied to the recovered effect-seven path.

Test Plan:
- cargo test --all-targets
- cargo clippy --all-targets --all-features -- -D warnings
- rumdl check CHANGELOG.md RECONSTRUCTION.md README.md
- git diff --check

tdkpin-rs/CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to
 
 ### Fixed
 
+- Spawn effect-seven ball 2 from record 148 at `(17,23)` with exact
+  `(0,3040)` millipixel velocity, instead of launching a guessed second ball
+  upward from the shooter lane.
 - Replace invented bumper outline/cooldown effects with the original per-record
   5/20/10 callback countdowns and exact overlay-A render rectangles for bumpers
   51-53 and targets 140-147/150-152.