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/opcode.py

@@ -0,0 +1,122 @@
+
+"""
+opcode module - potentially shared between dis and other modules which
+operate on bytecodes (e.g. peephole optimizers).
+"""
+
+
+__all__ = ["cmp_op", "stack_effect", "hascompare", "opname", "opmap",
+           "HAVE_ARGUMENT", "EXTENDED_ARG", "hasarg", "hasconst", "hasname",
+           "hasjump", "hasjrel", "hasjabs", "hasfree", "haslocal", "hasexc"]
+
+import builtins
+import _opcode
+from _opcode import stack_effect
+
+from _opcode_metadata import (_specializations, _specialized_opmap, opmap,  # noqa: F401
+                              HAVE_ARGUMENT, MIN_INSTRUMENTED_OPCODE)  # noqa: F401
+EXTENDED_ARG = opmap['EXTENDED_ARG']
+
+opname = ['<%r>' % (op,) for op in range(max(opmap.values()) + 1)]
+for m in (opmap, _specialized_opmap):
+    for op, i in m.items():
+        opname[i] = op
+
+cmp_op = ('<', '<=', '==', '!=', '>', '>=')
+
+# These lists are documented as part of the dis module's API
+hasarg = [op for op in opmap.values() if _opcode.has_arg(op)]
+hasconst = [op for op in opmap.values() if _opcode.has_const(op)]
+hasname = [op for op in opmap.values() if _opcode.has_name(op)]
+hasjump = [op for op in opmap.values() if _opcode.has_jump(op)]
+hasjrel = hasjump  # for backward compatibility
+hasjabs = []
+hasfree = [op for op in opmap.values() if _opcode.has_free(op)]
+haslocal = [op for op in opmap.values() if _opcode.has_local(op)]
+hasexc = [op for op in opmap.values() if _opcode.has_exc(op)]
+
+
+_intrinsic_1_descs = _opcode.get_intrinsic1_descs()
+_intrinsic_2_descs = _opcode.get_intrinsic2_descs()
+_special_method_names = _opcode.get_special_method_names()
+_common_constants = [builtins.AssertionError, builtins.NotImplementedError,
+                     builtins.tuple, builtins.all, builtins.any]
+_nb_ops = _opcode.get_nb_ops()
+
+hascompare = [opmap["COMPARE_OP"]]
+
+_cache_format = {
+    "LOAD_GLOBAL": {
+        "counter": 1,
+        "index": 1,
+        "module_keys_version": 1,
+        "builtin_keys_version": 1,
+    },
+    "BINARY_OP": {
+        "counter": 1,
+        "descr": 4,
+    },
+    "UNPACK_SEQUENCE": {
+        "counter": 1,
+    },
+    "COMPARE_OP": {
+        "counter": 1,
+    },
+    "CONTAINS_OP": {
+        "counter": 1,
+    },
+    "FOR_ITER": {
+        "counter": 1,
+    },
+    "LOAD_SUPER_ATTR": {
+        "counter": 1,
+    },
+    "LOAD_ATTR": {
+        "counter": 1,
+        "version": 2,
+        "keys_version": 2,
+        "descr": 4,
+    },
+    "STORE_ATTR": {
+        "counter": 1,
+        "version": 2,
+        "index": 1,
+    },
+    "CALL": {
+        "counter": 1,
+        "func_version": 2,
+    },
+    "CALL_KW": {
+        "counter": 1,
+        "func_version": 2,
+    },
+    "STORE_SUBSCR": {
+        "counter": 1,
+    },
+    "SEND": {
+        "counter": 1,
+    },
+    "JUMP_BACKWARD": {
+        "counter": 1,
+    },
+    "TO_BOOL": {
+        "counter": 1,
+        "version": 2,
+    },
+    "POP_JUMP_IF_TRUE": {
+        "counter": 1,
+    },
+    "POP_JUMP_IF_FALSE": {
+        "counter": 1,
+    },
+    "POP_JUMP_IF_NONE": {
+        "counter": 1,
+    },
+    "POP_JUMP_IF_NOT_NONE": {
+        "counter": 1,
+    },
+}
+
+_inline_cache_entries = {
+    name : sum(value.values()) for (name, value) in _cache_format.items()
+}