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/reconstructed/tests/test_timer_tick.c

@@ -466,7 +466,7 @@ static void test_intro_tick_32_and_marquee(void)
     assert(g_restore_b_id_count == 1 && g_restore_b_ids[0] == 1002);
     assert(g_region_a_calls == 2 && g_region_b_calls == 1);
     assert(g_present_calls == 3);
-    assert(g_item_calls == 1 && g_last_item == 0);
+    assert(g_item_calls == 1 && g_last_item == 4);
 
     prepare_fixture();
     win16_write_u8(win16_dgroup_pointer(0x07c9), 1);
@@ -485,6 +485,29 @@ static void test_intro_tick_32_and_marquee(void)
            g_blits[3].x == 233 && g_blits[3].y == 372);
     assert(g_select_calls == 5 && g_delete_object_calls == 1);
     assert(g_delete_dc_calls == 2);
+
+    static const struct {
+        uint32_t before_tick;
+        int16_t expected_item;
+    } item_cases[] = {
+        {7, 1},
+        {71, 9},
+        {79, 8},
+        {135, 1},
+        {143, 0},
+    };
+    for (size_t index = 0;
+         index < sizeof(item_cases) / sizeof(item_cases[0]);
+         index++) {
+        prepare_fixture();
+        win16_write_u8(win16_dgroup_pointer(0x07c9), 1);
+        win16_write_u32(
+            win16_dgroup_pointer(0x0876), 0,
+            item_cases[index].before_tick);
+        tdkpin_timer_tick_with_frame(0x0300, g_window);
+        assert(g_item_calls == 1);
+        assert(g_last_item == item_cases[index].expected_item);
+    }
 }
 
 static void test_panel_and_game_initialization(void)