docs: update OpenCode configuration example in README

---

## Explanation
The diff only modifies `Readme.md`, changing the OpenCode configuration snippet. The update replaces the old local config path with a global one, adds a `$schema` reference, restructures the `command` field, and introduces `type` and `enabled` properties. Therefore, a **docs**‑type conventional commit is appropriate, describing the documentation change.

Readme.md

@@ -49,13 +49,15 @@ Add to your MCP client configuration using `bunx` (no installation required):
 }
 ```
 
-**OpenCode** (`.opencode/mcp.json`):
+**OpenCode** (global config `~/.config/opencode/opencode.json` or project config `opencode.json`):
 ```json
 {
-  "servers": {
+  "$schema": "https://opencode.ai/config.json",
+  "mcp": {
     "ask262": {
-      "command": "bunx",
-      "args": ["ask262"]
+      "type": "local",
+      "command": ["bunx", "ask262"],
+      "enabled": true
     }
   }
 }