fix(obsidian-kb): fix SKILL.md YAML format and restore files

skills/webhook-gen/src/index.ts

@@ -0,0 +1,29 @@
+import OpenAI from "openai";
+
+const openai = new OpenAI();
+
+export async function generateWebhook(eventDescription: string, framework: string = "express"): Promise<string> {
+  const response = await openai.chat.completions.create({
+    model: "gpt-4o-mini",
+    messages: [
+      {
+        role: "system",
+        content: `You generate production-ready webhook handler code.
+Rules:
+- Include signature verification
+- Add exponential backoff retry logic
+- Handle idempotency (dedup by event ID)
+- Proper error handling and logging
+- Type-safe where possible
+- Framework: ${framework}
+- Include both the handler and a retry utility
+- Return ONLY the code, no explanations`
+      },
+      { role: "user", content: `Generate a webhook handler for: ${eventDescription}` }
+    ],
+    temperature: 0.3,
+  });
+
+  const result = response.choices[0].message.content?.trim() || "";
+  return result.replace(/^```[\w]*\n?/, "").replace(/\n?```$/, "");
+}