selfhost-compiler: make EmitterBox/MirEmitterBox static; call as Class.method to avoid NewBox→birth warnings and stabilize JSON emission path

apps/selfhost-compiler/boxes/emitter_box.nyash

@@ -1,5 +1,5 @@
 // EmitterBox — thin wrapper to emit JSON v0 (extracted)
-box EmitterBox {
+static box EmitterBox {
   emit_program(json, usings_json) {
     if json == null { return json }
     // Normalize usings payload to at least an empty array so meta.usings is always present
@@ -20,7 +20,3 @@ box EmitterBox {
     return head + "\"meta\":{\"usings\":" + payload + "}" + tail
   }
 }
-
-static box EmitterStub {
-  main(args) { return 0 }
-}

apps/selfhost-compiler/boxes/mir_emitter_box.nyash

@@ -2,7 +2,7 @@
 // Scope: Return(Int) only (const + ret). Safe default to 0 when not found.
 // Future: add Binary/Compare/ExternCall/BoxCall lowering incrementally.
 
-box MirEmitterBox {
+static box MirEmitterBox {
   // Extract first Return(Int) value from Stage-1 JSON (very small string scan)
   _extract_return_int(ast_json) {
     if ast_json == null { return 0 }
@@ -47,6 +47,3 @@ box MirEmitterBox {
     return s
   }
 }
-
-static box MirEmitterStub { main(args) { return 0 } }
-

apps/selfhost-compiler/compiler.nyash

@@ -115,12 +115,10 @@ static box Main {
 
     if emit_mir == 1 {
       // Lower minimal AST to MIR JSON (Return(Int) only for MVP)
-      local mir = new MirEmitterBox()
-      json = mir.emit_mir_min(ast_json)
+      json = MirEmitterBox.emit_mir_min(ast_json)
     } else {
       // Emit Stage‑1 JSON with metadata
-      local emitter = new EmitterBox()
-      json = emitter.emit_program(ast_json, me._usings)
+      json = EmitterBox.emit_program(ast_json, me._usings)
     }
 
     // Output JSON