Add markers module, framecrash stub, debug console, build-flag wiring

Markers: client-side world object system using CreateGameObject. Places
M2 models at arbitrary world positions via Lua commands (/mark test,
/mark pos). Includes embedded addon, xyz.m2/blp assets served from DLL
memory, position helpers from unit movement struct, and object lifecycle
management (create, cleanup, reposition, alpha, animation).

Framecrash: stub module with reference to crash at 0x007A2452.

Console: debug output via AllocConsole/WriteConsoleA, compiles out
entirely in non-Debug builds. Used by markers and file serve logging.

Build: markers added to feature flag matrix and all-variants step.
Main: conditional markers import, Lua function registration, embedded
addon + asset file serving, console init/deinit lifecycle.

Outline README: added misc planned features and debug mode notes.

src/markers/offsets.zig

@@ -0,0 +1,96 @@
+//! Offsets for marker/game object system
+
+// =============================================================================
+// Unit position
+// =============================================================================
+
+/// Unit + this → movement struct pointer
+pub const UNIT_MOVEMENT_OFFSET: usize = 0x118;
+
+/// Movement struct + this → X coordinate (float)
+pub const MOVEMENT_POS_X: usize = 0x10;
+
+/// Movement struct + this → Y coordinate (float)
+pub const MOVEMENT_POS_Y: usize = 0x14;
+
+/// Movement struct + this → Z coordinate (float)
+pub const MOVEMENT_POS_Z: usize = 0x18;
+
+// =============================================================================
+// GameObject creation functions
+// =============================================================================
+
+/// CreateGameObject_WithProperties(model_ECX, callback1_EDX, callback2, x, y, z, flags)
+/// __fastcall — ECX=model, EDX=callback1, 5 stack params. Callee cleans (RET 0x14).
+/// Ghidra: 55 8B EC 83 EC 14 ... 89 4D FC (saves ECX) ... 89 55 F8 (saves EDX) ... C2 14 00.
+pub const FN_CREATE_GAMEOBJECT: usize = 0x00670db0;
+
+/// AllocateAndInitializeWorldObject(initializeFlag)
+/// __fastcall returns void**
+pub const FN_ALLOCATE_WORLD_OBJECT: usize = 0x006a0930;
+
+/// CleanupWorldObject(object)
+/// __thiscall
+pub const FN_CLEANUP_WORLD_OBJECT: usize = 0x0069d730;
+
+/// DestroyWorldObjectAndRelease(object)
+/// __fastcall
+pub const FN_DESTROY_WORLD_OBJECT: usize = 0x006a0a70;
+
+// =============================================================================
+// Model loading
+// =============================================================================
+
+/// loadModelByName(path)
+/// __fastcall returns model cache entry
+pub const FN_LOAD_MODEL_BY_NAME: usize = 0x006d4640;
+
+/// createModelAttachment(resourceManager, path, flags)
+/// __thiscall returns render context
+pub const FN_CREATE_MODEL_ATTACHMENT: usize = 0x00707350;
+
+// =============================================================================
+// Animation control
+// =============================================================================
+
+/// PlayAnimation(object, animId)
+/// __thiscall
+pub const FN_PLAY_ANIMATION: usize = 0x0076cf50;
+
+/// CM2Model__PlayBoneAnimation(model, boneIndex, animId, seqIndex, animData, speed, blend, queue)
+/// __thiscall
+pub const FN_PLAY_BONE_ANIMATION: usize = 0x007121a0;
+
+/// HasAnimation(model, animId)
+/// __thiscall returns bool
+pub const FN_HAS_ANIMATION: usize = 0x00711960;
+
+// =============================================================================
+// Animation IDs (from string table)
+// =============================================================================
+
+pub const ANIM_SPAWN: u32 = 0;      // TODO: find actual ID
+pub const ANIM_DESPAWN: u32 = 0;    // TODO: find actual ID
+pub const ANIM_BIRTH: u32 = 0;      // TODO: find actual ID
+
+// =============================================================================
+// Object structure offsets (from CreateGameObject_WithProperties analysis)
+// =============================================================================
+
+/// WorldObject + this → model pointer
+pub const OBJ_MODEL: usize = 0x88;
+
+/// WorldObject + this → position X (float*)
+pub const OBJ_POS_X: usize = 0xC0;
+
+/// WorldObject + this → position Y (float*)
+pub const OBJ_POS_Y: usize = 0xC4;
+
+/// WorldObject + this → position Z (float*)
+pub const OBJ_POS_Z: usize = 0xC8;
+
+/// WorldObject + this → color ARGB (alpha in high byte)
+pub const OBJ_COLOR: usize = 0x24;
+
+/// WorldObject + this → flags
+pub const OBJ_FLAGS: usize = 0x90;