[
  {
    "stage_index": 1,
    "name": "Environment & Headless Browser Launch",
    "action_type": "setup",
    "description": "Launch Playwright/Selenium headless browser or Xvfb display server."
  },
  {
    "stage_index": 2,
    "name": "Render Page & Screenshot Capture",
    "action_type": "inspection",
    "description": "Capture PNG snapshot of rendered webpage or component."
  },
  {
    "stage_index": 3,
    "name": "Visual Diff & Metric Evaluation",
    "action_type": "output_validation",
    "description": "Compare against reference screenshot or inspect bounding boxes."
  },
  {
    "stage_index": 4,
    "name": "CSS/Frontend Code Modification",
    "action_type": "code_modification",
    "description": "Modify frontend CSS/HTML/JS assets to align visual presentation."
  },
  {
    "stage_index": 5,
    "name": "Re-render & Verification Loop",
    "action_type": "verification",
    "description": "Re-take screenshot and loop until layout discrepancy falls below perceptual threshold."
  }
]