feat: add tea-context.ts tool for context helpers (whoami)

.opencode/tools/tea-context.ts

@@ -0,0 +1,19 @@
+import { tool } from "@opencode-ai/plugin"
+import { $ } from "bun"
+
+export const whoami = tool({
+  description: "Get current logged-in user info for the Gitea instance",
+  args: {},
+  async execute(args, context) {
+    try {
+      const result = await $`tea whoami --output json`.text()
+      return JSON.parse(result)
+    } catch (error: any) {
+      return {
+        error: "Failed to get current user info",
+        message: error.message,
+        stderr: error.stderr?.toString(),
+      }
+    }
+  },
+})