Replace the overlap-and-separate circle approximation with the original swept
ball-center entry test and radial/tangent fixed-point response. Preserve every
type-1 record's Real48 rebound and tangent coefficients, plus the bumper normal
kick derived from the 3800-unit speed scalar.
Unify line and circle traversal in original object-id order and remove the old
floating passive-circle and bumper impulses. Add exact tests for live object 155
and bumper 51 transitions, and keep moving flippers as the explicit remaining
collision approximation.
Test Plan:
- `cargo test --all-targets` -- 44 passed
- `cargo clippy --all-targets -- -D warnings` -- passed
- `cargo build --profile production` -- passed
- 20-second deterministic launch traversed bumpers and drained without rescue
- live object 155 and bumper 51 fixed-point transitions matched exactly
- `git diff --cached --check` -- passed
ddidderr
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