fix(physics): gate dynamic impulse on capture age

Match records 174/175 by transferring normal impulse only when the other slot capture age is nonpositive. A held slot now keeps its velocity and the moving ball resolves with the full normal velocity; successful transfer retains the original normal_velocity-1000 response.

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/src/game.rs

@@ -749,6 +749,7 @@ impl Game {
                 ball.spin,
                 other_position,
                 MilliVec::from_velocity_per_second(secondary.velocity),
+                secondary.capture_age <= 0,
             );
             if predicted.x >= other_position.x.wrapping_sub(21_000)
                 && predicted.x <= other_position.x.wrapping_add(21_000)
@@ -1140,6 +1141,7 @@ impl Game {
         };
         let primary_position = self.ball.position;
         let primary_velocity = self.ball.velocity;
+        let primary_capture_age = self.ball.capture_age;
         let old_position = MilliVec::from_position(ball.position);
         let mut velocity = MilliVec::from_velocity_per_second(ball.velocity);
         velocity.y += GRAVITY_MILLI_PER_STEP;
@@ -1173,6 +1175,7 @@ impl Game {
                 ball.spin,
                 other_position,
                 MilliVec::from_velocity_per_second(primary_velocity),
+                primary_capture_age <= 0,
             )
             && best_collision.is_none()
         {