The call tag was not updating exported scene variables. Assignments like <call method="hoge = 1" /> created local variables instead of modifying the scene context, breaking conditional logic and variable expansion.

Root Cause

executeCode() passed scene properties by value, making assignments local-only:

// Before: assignments create local variables
const context = { ...this.sceneFile }
const func = new Function(...Object.keys(context), code)
return func.apply(null, Object.values(context))

Changes

• Modified executeCode() to use Proxy: Intercepts property access/assignment to modify sceneFile directly
• Uses with statement: Enables natural variable syntax while maintaining reference to source object
• Added comprehensive unit tests: Covers assignment, conditions, expansion, and the reported if_test scenario

// After: assignments modify sceneFile properties
const context = new Proxy(this.sceneFile, {
  get: (target, key) => target[key],
  set: (target, key, value) => {
    target[key] = value
    return true
  }
})
const func = new Function('context', `with(context) { ${code} }`)
return func.call(null, context)

Verification

Manual test confirms proper behavior:

Variable assignments now propagate correctly to conditionals (if="hoge==1") and expansions ({{hoge}}).

• Fixes callタグが機能しない #116

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