fix: remove runners as optional dependencies

Having Gemini CLI and others as optional dependencies appears to throw off packages that also depend on them locally.

These changes remove it since we don't import these packages directly anywhere anyways.

Author: crisbeto

package.json

@@ -90,11 +90,6 @@
     "zod": "^3.23.8",
     "zod-validation-error": "^4.0.1"
   },
-  "optionalDependencies": {
-    "@anthropic-ai/claude-code": "^2.0.0",
-    "@google/gemini-cli": "^0.9.0",
-    "@openai/codex": "^0.47.0"
-  },
   "devDependencies": {
     "@anthropic-ai/claude-code": "^2.0.0",
     "@google/gemini-cli": "^0.9.0",