fix(tests): update OpenAI env vars in cli-smoke test

- Replace legacy env vars with new OpenAI_* keys
- Align test with updated config keys in CLI smoke test

The cli-smoke test now uses the new OpenAI_API_KEY, OPENAI_API_BASE_URL,
and OPENAI_MODEL environment variables instead of the deprecated
OPENAI_COMPACT_* names to reflect updated configuration.

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

Author: xesrevinu

tests/cli-smoke.test.ts

@@ -105,9 +105,9 @@ describe.concurrent("cli smoke", () => {
     const result = runCli(["config", "show", "--cwd", dir], {
       env: {
         XDG_CONFIG_HOME: xdgHome,
-        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: "https://build.example/v1",
         GIT_AGENT_BUILD_MODEL: "build-model",