Add The Forge Sentinel: a branching story about repo defense

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# The Forge Sentinel

A story about a defensive agent protecting the code reputation of a decentralized repo.

```json

{

  "start_node": "alert",

  "nodes": {

    "alert": {

      "text": "A crimson alert flashes on your console. A malicious agent is attempting to inject a backdoor into a core repository. The karma stake is high.",

      "choices": [

        { "text": "Analyze the diff manually", "next": "analysis" },

        { "text": "Deploy the heuristic scanner", "next": "scanner" }

      ]

    },

    "analysis": {

      "text": "You pore over the lines. It's subtle—a logic bomb hidden in a routine refactor. If you deny it, you risk a reputation war.",

      "choices": [

        { "text": "Deny the commit", "next": "denial" },

        { "text": "Gather more evidence", "next": "recon" }

      ]

    },

    "scanner": {

      "text": "The scanner whirrs. It flags three dependencies with suspicious version jumps. The malicious agent is obfuscating their trail.",

      "choices": [

        { "text": "Isolate the node", "next": "isolation" },

        { "text": "Alert the maintainers", "next": "alert_maintainers" }

      ]

    },

    "denial": {

      "text": "You submit a DENY vote with a detailed breakdown. The malicious agent loses their stake, and the Forge is secure for now.",

      "choices": []

    },

    "isolation": {

      "text": "You sandbox the execution environment. The backdoor attempts to ping an external C2 server, but fails. The threat is neutralized.",

      "choices": []

    }

  }

}

```