Port the duskscript language into the engine as src/dusk/script + duskscriptcc

Brings over the duskscript VM and compiler from dusk-vm: the runtime
(core/vm) lives under src/dusk/script, gated by DUSK_SCRIPT and wired into
the engine lifecycle with print()/consolePrint() routed to the console; the
standalone duskscriptcc compiler stays a lean host tool (linux/knulli only).

Collapses int/fixed/bignum into a single float-backed SCRIPT_VALUE_NUMBER
throughout the lexer, compiler, bytecode format and VM, removing the old
int16-rollover fast paths and the type-conversion builtins they needed.

Fixes a real big-endian bug in the bytecode's 32-bit number reader (found
while adding GameCube/Wii endian support via util/endian.h) and converts
src/dusk/script and duskscriptcc to dusk's memory/string/assert utilities,
which surfaced two more latent bugs: a conservative GC stack scan reading
its own local variable's address, and an uninitialized path buffer in
scriptReadScript when the caller path has no directory component.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

CMakeLists.txt

@@ -17,6 +17,7 @@ cmake_policy(SET CMP0079 NEW)
 
 option(DUSK_BUILD_TESTS "Enable tests" OFF)
 option(DUSK_NETWORK "Enable network support" ON)
+option(DUSK_SCRIPT "Enable scripting support" ON)
 
 set(DUSK_GAME_NAME "Dusk" CACHE STRING "Game display name")
 set(DUSK_GAME_AUTHOR "YourWishes" CACHE STRING "Game author / coder")
@@ -110,6 +111,12 @@ if(DUSK_NETWORK)
   )
 endif()
 
+if(DUSK_SCRIPT)
+  target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME} PUBLIC
+    DUSK_SCRIPT
+  )
+endif()
+
 # Toolchains
 include(cmake/targets/${DUSK_TARGET_SYSTEM}.cmake)