Remove Perigon News integration and related SDK components

The Perigon News integration, SDK, and associated tools were removed from the repository. This includes the agent script, API SDK, and OpenAPI definitions for managing news-related operations. The changes simplify the codebase, eliminating unused or outdated dependencies.

packages/genaiscript/genaisrc/agent.genai.mts

@@ -1,24 +0,0 @@
-import {PerigonClient as NewsSearchTool} from "@agentic/perigon";
-
-script({
-    system: ["system.tools"],
-    tools: "agent",
-    maxTokens: 8192
-})
-
-const newSearchTool = new NewsSearchTool();
-
-defTool(newSearchTool)
-
-$`You are a chat assistant that uses agent tools to solve problems.
-
-while true:
-    - ask the user for a question using the agent_user_input
-    - make a plan to answer the question step by step
-    - answer the question
-end while
-
-## guidance:
-    - use the agent tools to help you
-    - do NOT try to ask the user questions directly, use the agent_user_input tool instead.
-`