ddidderr 6e6b7f4c58 fix(rules): scope double scoring to the active ball
The binary stores the diamond-bank double flag at receiver +0x0bdc and clears
it in normal_ball_end. Rust stored that flag on Player, so it incorrectly
survived every normal drain and player turn. The special effect-seven respawn
is intentionally different because it bypasses normal_ball_end.

Represent the flag as an explicit ball-double state on Game. Clear it only on
the normal ball-end path, preserve it through the special respawn, and make the
first completed diamond bank after a normal drain re-enable double scoring
without adding 100,000 secondary points. Keep the independent multiball factor,
so both active factors still stack to 4x.

Test Plan:
- `cargo test --workspace --all-targets --all-features` -- 117 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
2026-08-23 19:58:39 +02:00
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