- Expand `learn/guides/devindex/spider/Engine.md` to include a "Discovery Workflow: Step-by-Step" section. - Explicitly document the 6 execution steps (State Loading, Strategy Selection, Execution, Extraction, Filtering, Persistence). - Embed relevant code snippets from `Spider.mjs` for each step to ground the documentation in the code. - Add a focused Mermaid diagram detailing the "Extraction & Filtering" decision tree.