feat: add tea-label.ts tool for label management (labelList)

.opencode/tools/tea-label.ts

@@ -0,0 +1,19 @@
+import { tool } from "@opencode-ai/plugin"
+import { $ } from "bun"
+
+export const labelList = tool({
+  description: "List available labels with their colors and descriptions",
+  args: {},
+  async execute(args, context) {
+    try {
+      const result = await $`tea label list --output json`.text()
+      return JSON.parse(result)
+    } catch (error: any) {
+      return {
+        error: "Failed to list labels",
+        message: error.message,
+        stderr: error.stderr?.toString(),
+      }
+    }
+  },
+})