Add tea-issue-get tool for retrieving issues with comments

.opencode/tools/tea-issue-get.ts

@@ -0,0 +1,13 @@
+import { tool } from "@opencode-ai/plugin"
+import { $ } from "bun"
+
+export default tool({
+  description: "Get a specific issue with all details and comments using tea CLI",
+  args: {
+    issueNumber: tool.schema.number().describe("Issue number/index"),
+  },
+  async execute(args) {
+    const result = await $`tea issues ${args.issueNumber} --comments --output json`.text()
+    return result.trim()
+  },
+})