Add repo settings API integration and move workflows into action

- Add getRepoSettings utility to fetch repo settings from Pullfrog API
- Integrate repo settings fetch in main.ts with agent validation
- Move workflows from lib/workflows.ts into action/workflows.ts
- Update workflow prompts to include comment management steps
- Add 'Prompt' workflow as fallback for general tasks
- Fix null check for response.body in claude agent tarball download
- Remove unused message handlers (tool_progress, auth_status)
- Fix tsconfig.json indentation consistency

agents/shared.ts

@@ -1,6 +1,6 @@
 import type { McpServerConfig } from "@anthropic-ai/claude-agent-sdk";
-import { workflows } from "../../lib/workflows.ts";
 import { ghPullfrogMcpName } from "../mcp/config.ts";
+import { workflows } from "../workflows.ts";
 
 /**
  * Result returned by agent execution