fix(attract): use remainder-driven item phases

Raw 1000:061c-063b divides the idle tick by 144, copies the remainder from
CX:BX into AX:DX, and only then divides by 8. Readable C and Rust instead used
an unbounded quotient equivalent to tick/1152, making DAT801-809 advance far
too slowly and suggesting a nonexistent negative long-idle index.

Use `(tick % 144) / 8` to repeat item states 0,1..9,8..1 every 144 callbacks.
Remove the disproven long-idle status crops and restore the ten-minute simulator
ceiling. Extend the C and Rust phase tests across the forward, reverse, and wrap
boundaries.

Test Plan:
- raw instruction review at `1000:061c-063b` -- remainder transfer confirmed
- `cargo test --workspace --all-targets --all-features` -- 125 passed
- `cargo clippy --workspace --all-targets --all-features -- -D warnings` -- passed
- `bash original/tools/test_reconstructed_c.sh` -- passed
- `python3 original/tools/audit_reconstruction.py --require-complete` -- passed with zero incomplete or unclassified units
- `rumdl check --flavor commonmark RECONSTRUCTION.md CHANGELOG.md` -- passed
- `git diff --cached --check` -- passed

original/C_RECONSTRUCTION_FINAL_AUDIT.md

@@ -94,6 +94,11 @@ Wine record-57 transition `(75530,354765)/(3000,15)` to
 `(77369,356597)/(1839,1832)` with exact Real48 spin `-5.28`, plus record 72
 `(235348,356825)/(-3000,15)` to `(233253,358494)/(-2095,1669)` with spin
 `+5.46`, seal both paths and both relative slingshot chains.
+Raw `1000:061c-063b` further distinguishes the DOS divide outputs in the idle
+item animation: it copies the remainder of `tick / 144` from `CX:BX` and then
+divides that value by 8. The readable C and focused timer harness therefore use
+`(tick % 144) / 8`, producing the repeating `0,1..9,8..1` sequence without the
+previously inferred unbounded quotient.
 
 ## Reproducible gates