fix(physics): replace fitted flipper transfer

Remove the live-fitted upward and downward flipper polynomials. Port the
reconstructed 1000:7ed9 path with delta-specific pivots and record edges,
integer cross-product and radius gates, penetration, response-record gain,
wrapping velocity updates, and the final position delta.

Use resting records on press and the already-raised records on release, correct
the original delta direction, and apply each edge to both live ball slots. Keep
render-facing Vec2 projections, but adjust their float representation by ULPs so
every gameplay millipixel round-trips exactly instead of losing reconstructed
integer results.

Test Plan:
- `bash original/tools/test_reconstructed_c.sh` -- passed during raised-record reference capture
- `cargo test --all-targets` -- passed, 62 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 +10,11 @@ and this project adheres to
 
 ### Fixed
 
+- Replace the live-fitted flipper transfer polynomials with the reconstructed
+  `1000:7ed9` millipixel geometry gates, penetration, gain, response-record,
+  velocity, and position calculations for both directions and both balls.
+- Preserve every gameplay millipixel across the float-only render projection so
+  exact integer physics results are not changed when stored for drawing.
 - 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.