WASM Python integration milestone - game.py runs in browser

Major milestone for issue #158 (Emscripten/WebAssembly build target):
- Python 3.14 successfully initializes and runs in WASM
- mcrfpy module loads and works correctly
- Game scripts execute with full level generation
- Entities (boulders, rats, cyclops, spawn points) placed correctly

Key changes:
- CMakeLists.txt: Add 2MB stack, Emscripten link options, preload files
- platform.h: Add WASM-specific implementations for executable paths
- HeadlessTypes.h: Make Texture/Font/Sound stubs return success
- CommandLineParser.cpp: Guard filesystem operations for WASM
- McRFPy_API.cpp: Add WASM path configuration, debug output
- game.py: Make 'code' module import optional (not available in WASM)
- wasm_stdlib/: Add minimal Python stdlib for WASM (~4MB)

Build with: emmake make (from build-emscripten/)
Test with: node mcrogueface.js

Next steps:
- Integrate VRSFML for actual WebGL rendering
- Create HTML page to host WASM build
- Test in actual browsers

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

wasm_stdlib/lib/python3.14/importlib/machinery.py

@@ -0,0 +1,50 @@
+"""The machinery of importlib: finders, loaders, hooks, etc."""
+
+from ._bootstrap import ModuleSpec
+from ._bootstrap import BuiltinImporter
+from ._bootstrap import FrozenImporter
+from ._bootstrap_external import (
+    SOURCE_SUFFIXES, BYTECODE_SUFFIXES, EXTENSION_SUFFIXES,
+    DEBUG_BYTECODE_SUFFIXES as _DEBUG_BYTECODE_SUFFIXES,
+    OPTIMIZED_BYTECODE_SUFFIXES as _OPTIMIZED_BYTECODE_SUFFIXES
+)
+from ._bootstrap_external import WindowsRegistryFinder
+from ._bootstrap_external import PathFinder
+from ._bootstrap_external import FileFinder
+from ._bootstrap_external import SourceFileLoader
+from ._bootstrap_external import SourcelessFileLoader
+from ._bootstrap_external import ExtensionFileLoader
+from ._bootstrap_external import AppleFrameworkLoader
+from ._bootstrap_external import NamespaceLoader
+
+
+def all_suffixes():
+    """Returns a list of all recognized module suffixes for this process"""
+    return SOURCE_SUFFIXES + BYTECODE_SUFFIXES + EXTENSION_SUFFIXES
+
+
+__all__ = ['AppleFrameworkLoader', 'BYTECODE_SUFFIXES', 'BuiltinImporter',
+           'DEBUG_BYTECODE_SUFFIXES', 'EXTENSION_SUFFIXES',
+           'ExtensionFileLoader', 'FileFinder', 'FrozenImporter', 'ModuleSpec',
+           'NamespaceLoader', 'OPTIMIZED_BYTECODE_SUFFIXES', 'PathFinder',
+           'SOURCE_SUFFIXES', 'SourceFileLoader', 'SourcelessFileLoader',
+           'WindowsRegistryFinder', 'all_suffixes']
+
+
+def __getattr__(name):
+    import warnings
+
+    if name == 'DEBUG_BYTECODE_SUFFIXES':
+        warnings.warn('importlib.machinery.DEBUG_BYTECODE_SUFFIXES is '
+                      'deprecated; use importlib.machinery.BYTECODE_SUFFIXES '
+                      'instead.',
+                      DeprecationWarning, stacklevel=2)
+        return _DEBUG_BYTECODE_SUFFIXES
+    elif name == 'OPTIMIZED_BYTECODE_SUFFIXES':
+        warnings.warn('importlib.machinery.OPTIMIZED_BYTECODE_SUFFIXES is '
+                      'deprecated; use importlib.machinery.BYTECODE_SUFFIXES '
+                      'instead.',
+                      DeprecationWarning, stacklevel=2)
+        return _OPTIMIZED_BYTECODE_SUFFIXES
+
+    raise AttributeError(f'module {__name__!r} has no attribute {name!r}')