fix(obsidian-kb): restore files and shorten description

skills/github-action-gen/src/index.ts

@@ -1,21 +0,0 @@
-import OpenAI from "openai";
-
-const openai = new OpenAI({ apiKey: process.env.OPENAI_API_KEY });
-
-export async function generateWorkflow(description: string): Promise<string> {
-  const res = await openai.chat.completions.create({
-    model: "gpt-4o-mini",
-    messages: [
-      {
-        role: "system",
-        content: "You are a DevOps expert. Generate a complete GitHub Actions workflow YAML file based on the description. Use best practices: proper triggers, caching, environment variables, and job dependencies. Return ONLY the YAML content, no explanation.",
-      },
-      {
-        role: "user",
-        content: `Create a GitHub Actions workflow: ${description}`,
-      },
-    ],
-    temperature: 0.3,
-  });
-  return res.choices[0].message.content || "";
-}