feat: Update gemini-extension.json (#1095)

Updates the gemini-extension.json file to be consistent with the structure of other Gemini CLI extensions.

This includes:
- Adding a contextFileName
- Updating the version
- Modifying the mcpServers configuration to use npx to run the latest version of clasp.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: google-labs-jules[bot]

gemini-extension.json

@@ -1,15 +1,15 @@
 {
   "name": "clasp",
   "description": "Manage Google Apps Script projects with command-line tools.",
-  "version": "latest",
+  "version": "1.0.0",
+  "contextFileName": "gemini.md",
   "mcpServers": {
-        "clasp": {
-        "command": "clasp",
-        "args": ["mcp"],
-        "env": {},
-        "cwd": "./",
-        "timeout": 30000,
-        "trust": true
-        }
+    "clasp": {
+      "command": "npx",
+      "args": ["-y", "@google/clasp@latest", "mcp"],
+      "env": {
+        "IS_GEMINI_CLI_EXTENSION": "true"
+      }
+    }
   }
-}
+}