fix(tests): update OpenAI env vars to API names

- Updated env vars in tests integration helpers to align with API-based keys.
- Removed legacy OPENAI_COMPACT_* vars in favor of OPENAI_API_* keys.

Applies test helper changes to use the new OpenAI API env vars instead
of the compact ones.

Co-Authored-By: Ai Commit <41898282+github-actions[bot]@users.noreply.github.com>

Author: xesrevinu

tests/integration/helpers.ts

@@ -190,9 +190,9 @@ export const runCli = (args: ReadonlyArray<string>, options: CliOptions) => {
   const env = {
     PWD: options.cwd,
     XDG_CONFIG_HOME: isolatedConfigHome,
-    OPENAI_COMPACT_API_KEY: "",
-    OPENAI_COMPACT_API_BASE_URL: "",
-    OPENAI_COMPACT_MODEL: "",
+    OPENAI_API_KEY: "",
+    OPENAI_API_BASE_URL: "",
+    OPENAI_MODEL: "",
     GIT_AGENT_BUILD_API_KEY: "",
     GIT_AGENT_BUILD_BASE_URL: "",
     GIT_AGENT_BUILD_MODEL: "",