Add module control API, bigcursor with fractional scaling, shared mutex

Module control API:
- Three cdecl exports: WeirdUtils_IsModuleActive, WeirdUtils_DisableModule, WeirdUtils_DisableAll
- C header include/weirdutils_api.h for runtime DLL discovery
- All modules gain pub module_name, isActive(), shared mutex via src/mutex.zig
- build.zig refactored to module_list array of ModuleDesc

Bigcursor:
- D3D9 vtable hooks on SetCursorProperties/ShowCursor
- Scale2x/Scale3x pixel-art upscalers in pure Zig (replaces 12K-line hqx C)
- Bilinear resampler for fractional scales (1.0-4.0, default 1.2)
- Win32 cursor via CreateIconIndirect bypasses D3D9 32x32 limit
- FNV-1a hash cache for ~16 cursor bitmaps
- Lua API: SetCursorScale(n) / GetCursorScale()
- CVar cursorScale for Config.wtf persistence (tenths)

Other:
- Add dpslog module stub
- Docs and README updates

docs/CLAUDE_PROPER_OBJECT_REGISTRATION_PLAN.md

@@ -56,7 +56,7 @@ Also review the CLI Ghidra skill:
 
 ## Execution Plan
 
-## Phase 1 — Identify canonical native registration path
+## Phase 1 - Identify canonical native registration path
 
 ### Task 1.1: Recover true iterator and linkage semantics
 - Disassemble around `0x00683F80` (and nearby helpers) in detail.
@@ -80,7 +80,7 @@ Also review the CLI Ghidra skill:
 
 ---
 
-## Phase 2 — Build proper registration wrapper in markers module
+## Phase 2 - Build proper registration wrapper in markers module
 
 ### Task 2.1: Implement native-path wrapper
 - Add a wrapper that uses discovered native creator/registration APIs.
@@ -101,7 +101,7 @@ Also review the CLI Ghidra skill:
 
 ---
 
-## Phase 3 — Validation protocol (must pass)
+## Phase 3 - Validation protocol (must pass)
 
 Run and capture logs for: