feat: add optional llm-task JSON-only tool (#1498)

* feat(llm-task): add optional JSON-only LLM task tool

* fix(llm-task): fix invalid package.json

* fix(llm-task): fix invalid plugin manifest JSON

* fix(llm-task): fix index.ts import quoting

* fix(llm-task): load embedded runner from src or bundled dist

extensions/llm-task/clawdbot.plugin.json

@@ -0,0 +1,21 @@
+{
+  "id": "llm-task",
+  "name": "LLM Task",
+  "description": "Generic JSON-only LLM tool for structured tasks callable from workflows.",
+  "configSchema": {
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+      "defaultProvider": { "type": "string" },
+      "defaultModel": { "type": "string" },
+      "defaultAuthProfileId": { "type": "string" },
+      "allowedModels": {
+        "type": "array",
+        "items": { "type": "string" },
+        "description": "Allowlist of provider/model keys like openai-codex/gpt-5.2."
+      },
+      "maxTokens": { "type": "number" },
+      "timeoutMs": { "type": "number" }
+    }
+  }
+}