extract call environment preparation

Author: mgomes

docs/architecture.md

@@ -27,6 +27,7 @@ Key files:
 - `vibes/execution_call_capabilities.go` (call-time capability binding and contract registration)
 - `vibes/execution_call_globals.go` (strict global validation and call-time global binding)
 - `vibes/execution_call_classes.go` (call-time class body initialization in class-local scope)
+- `vibes/execution_call_env.go` (call env prep: argument rebind/bind and memory validation)
 - `vibes/execution_function_args.go` (function argument/default/type/ivar binding helpers)
 - `vibes/execution_calls.go` (callable dispatch + function invocation)
 - `vibes/execution_call_expr.go` (call expression target/args/kwargs/block evaluation)

vibes/execution_call_env.go

@@ -0,0 +1,18 @@
+package vibes
+
+func prepareCallEnvForFunction(exec *Execution, root *Env, rebinder *callFunctionRebinder, fn *ScriptFunction, args []Value, keywords map[string]Value) (*Env, error) {
+	callEnv := newEnv(root)
+	callArgs := rebinder.rebindValues(args)
+	callKeywords := rebinder.rebindKeywords(keywords)
+	if err := exec.bindFunctionArgs(fn, callEnv, callArgs, callKeywords, fn.Pos); err != nil {
+		return nil, err
+	}
+	exec.pushEnv(callEnv)
+	if err := exec.checkMemory(); err != nil {
+		exec.popEnv()
+		return nil, err
+	}
+	exec.popEnv()
+
+	return callEnv, nil
+}

vibes/execution_script.go

@@ -53,18 +53,10 @@ func (s *Script) Call(ctx context.Context, name string, args []Value, opts CallO
 		return NewNil(), err
 	}
 
-	callEnv := newEnv(root)
-	callArgs := rebinder.rebindValues(args)
-	callKeywords := rebinder.rebindKeywords(opts.Keywords)
-	if err := exec.bindFunctionArgs(fn, callEnv, callArgs, callKeywords, fn.Pos); err != nil {
-		return NewNil(), err
-	}
-	exec.pushEnv(callEnv)
-	if err := exec.checkMemory(); err != nil {
-		exec.popEnv()
+	callEnv, err := prepareCallEnvForFunction(exec, root, rebinder, fn, args, opts.Keywords)
+	if err != nil {
 		return NewNil(), err
 	}
-	exec.popEnv()
 
 	if err := exec.pushFrame(fn.Name, fn.Pos); err != nil {
 		return NewNil(), err