Phase E/I: expose evalScript() as a permanent debug API, finalize README

Promotes vpinball_wasm_eval_script from a one-off validation hack to a
supported PinballInstance.evalScript() method (runs arbitrary VBScript
against the live table via the interpreter's own debug-console entry
point) - useful standalone, and it's what confirms the DMD script API
rides the same execution path already proven by real flipper input.

Rewrites the README's Status/Roadmap/Known limitations to reflect
tonight's actual, hands-on-confirmed state: keyboard input, audio, and
VBScript-driven gameplay all verified end-to-end (not just code
review); two more real engine bugs found and fixed (GL back buffer
sized in logical instead of device pixels; back buffer never resynced
on resize, breaking fullscreen); the default table swap and why;
B2S backglass explicitly assessed and declined for now, with the
concrete reasons (no plugin subsystem wired for this build, no test
table to validate against) rather than left as a vague TODO.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

patches/vpinball/0004-game-loop-rewrite.patch

@@ -54,10 +54,10 @@ index 2a18ceb..a033615 100644
  class AuditTableCommand : public TableBasedCommand
 diff --git a/src/core/EmscriptenBridge.cpp b/src/core/EmscriptenBridge.cpp
 new file mode 100644
-index 0000000..e6bccde
+index 0000000..6e20009
 --- /dev/null
 +++ b/src/core/EmscriptenBridge.cpp
-@@ -0,0 +1,78 @@
+@@ -0,0 +1,93 @@
 +// license:GPLv3+
 +
 +// vpinball-wasm: JS-callable entry points for controlling the player's
@@ -133,6 +133,21 @@ index 0000000..e6bccde
 +   g_wasmPlayer = nullptr;
 +}
 +
++// Runs arbitrary VBScript against the running table's script interpreter,
++// via the same ScriptInterpreter::Evaluate() entry point the interpreter's
++// own debug console uses. Useful both as a debug/console hook for consumers
++// and, e.g., to exercise script-driven APIs (like the DMD pixel API) against
++// a table that doesn't itself call them, without needing to author a new
++// .vpx table.
++EMSCRIPTEN_KEEPALIVE
++int vpinball_wasm_eval_script(const char* script)
++{
++   if (g_wasmPlayer == nullptr || g_wasmPlayer->m_scriptInterpreter == nullptr)
++      return 0;
++   g_wasmPlayer->m_scriptInterpreter->Evaluate(script, false);
++   return 1;
++}
++
 +} // extern "C"
 +
 +#endif // __EMSCRIPTEN__