fix(scoring): preserve bumper sound precedence

Bumper flags are dispatched before the variable bumper award in the original
collision response. Rust duplicated the primary- and secondary-ball rule path
and appended WAVE 2006 after score mutation, which hid WAVE 2007 whenever that
award crossed a media/extra-ball threshold.

Share one bumper-rule helper for both ball slots, arm the five-callback visual
countdown, dispatch WAVE 2006, and only then add the weak or kicked bumper score.
An exact event-order regression keeps the threshold sound as the final audible
sample.

Test Plan:
- `cargo test --workspace --all-targets --all-features` -- 116 passed
- `cargo clippy --workspace --all-targets --all-features -- -D warnings` -- passed
- `rumdl check --flavor commonmark RECONSTRUCTION.md CHANGELOG.md` -- passed
- `git diff --cached --check` -- passed

tdkpin-rs/CHANGELOG.md

@@ -153,8 +153,9 @@ and this project adheres to
 - Dispatch the original per-call-site sound sequences instead of assigning one
   guessed WAV to each logical event. This removes the nonexistent WAV 2022
   playback and restores bank, trigger, capture, nudge, tilt, and drain cues.
-  Type-4 WAVE 2004 now precedes its score mutation so a simultaneously crossed
-  media marker leaves WAVE 2007 audible, as in the monophonic original.
+  Type-4 WAVE 2004 and bumper WAVE 2006 now precede their score mutations so a
+  simultaneously crossed media marker leaves WAVE 2007 audible, as in the
+  monophonic original.
 - Advance media/extra-ball thresholds only from score additions, preserve
   32-bit score wrapping, and restore the ninth-diamond ordering: its 24,464
   award remains single, then permanent double scoring and all three magnetic