refactor: add TeamArenaRef::from_ptr for typed construction

Add from_ptr(*mut TeamArenaState) alongside the existing from_raw(u32)
used by trampolines. fire_skip_go now constructs TeamArenaRef directly
from the typed DDGame.team_arena field pointer — no u32 cast.

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

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

@@ -1902,10 +1902,10 @@ pub struct TeamArenaRef {
 }
 
 impl TeamArenaRef {
-    /// Wrap a raw base pointer (for non-trampoline contexts like validation).
+    /// Wrap a raw integer pointer (for usercall trampoline register captures).
     ///
     /// # Safety
-    /// `base` must point to DDGame + TEAM_ARENA_STATE (0x4628).
+    /// `base` must point to a valid TeamArenaState (DDGame + 0x4628).
     #[inline]
     pub unsafe fn from_raw(base: u32) -> Self {
         Self {
@@ -1913,6 +1913,17 @@ impl TeamArenaRef {
         }
     }
 
+    /// Wrap a typed pointer to TeamArenaState.
+    ///
+    /// # Safety
+    /// `arena` must point to a valid TeamArenaState within a live DDGame.
+    #[inline]
+    pub unsafe fn from_ptr(arena: *mut TeamArenaState) -> Self {
+        Self {
+            base: arena as *mut u8,
+        }
+    }
+
     /// Access the TeamArenaState fields (read-only).
     #[inline]
     pub unsafe fn state(&self) -> &TeamArenaState {

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

@@ -409,8 +409,7 @@ unsafe fn fire_skip_go(worm: *const CTaskWorm, entry: *const WeaponEntry) {
     let bit_index = (*entry).fire_params._data[0] & 0x1F;
     let bit = 1u32 << bit_index;
 
-    let arena_ptr = &raw mut (*ddgame).team_arena as u32;
-    let arena = TeamArenaRef::from_raw(arena_ptr);
+    let arena = TeamArenaRef::from_ptr(&raw mut (*ddgame).team_arena);
     let header = arena.team_header_mut(team_index);
     let flags = header.turn_action_flags;