chore: clean up debug logging, document remaining differences

Remove temporary watchpoint and debug logging from ddgame_init.rs
and game_session.rs.

Remaining 5 DDGame field differences vs original constructor:
- +0x041C/+0x0420 (sprite_cache_2[38,39]): set by display system
side effect during layer.spr loading via message pump callback.
Traced to FUN_005733b0 called from display vtable[37] (0x56A4C0,
RET 0x10). Exact callback mechanism TBD.
- +0x7820/+0x7824/+0x7828: 3 extra sequential sprite index values
(0x8D-0x8F) in Rust, likely from load_resource_list storing
slightly different sprite ID counts.

None of these affect determinism (headless PASS) or gameplay.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/openwa-core/src/engine/ddgame.rs

@@ -1816,10 +1816,6 @@ unsafe fn init_graphics_and_resources(
             let hud_load: unsafe extern "thiscall" fn(*mut u8, *mut DDGame, *mut u8) =
                 core::mem::transmute(rb(va::DDGAME_LOAD_HUD_AND_WEAPON_SPRITES) as usize);
             hud_load(gfx_handler, ddgame, (*wrapper)._field_4c4);
-            let _ = crate::log::log_line(&format!(
-                "[DDGame] after LoadHudAndWeaponSprites: +0x37C=0x{:08X}",
-                (*ddgame).sprite_cache[144] as u32,
-            ));
         }
 
         // ── Loading progress ticks (2 of 4 — after LoadHudAndWeaponSprites) ──

crates/openwa-wormkit/src/replacements/ddgame_init.rs

@@ -120,6 +120,7 @@ static FIND_ENTRY_LOG_COUNT: core::sync::atomic::AtomicU32 = core::sync::atomic:
 
 extern "cdecl" fn impl_find_entry(name: u32, gfx_handler: u32) -> u32 {
     let result = unsafe { gfx_dir_find_entry(name as *const u8, gfx_handler as *mut u8) };
+
     // Log first 20 lookups for debugging
     let count = FIND_ENTRY_LOG_COUNT.fetch_add(1, core::sync::atomic::Ordering::Relaxed);
     if count < 20 {