chore(oss): add yamcodes/arkenv to OSS program (#776)

* chore(oss): add yamcodes/arkenv to OSS program

* fix(test): strip CODEX_AUTH_JSON in apiKeys auto-select test

The beforeEach strip list omitted CODEX_AUTH_JSON, which is in
`knownApiKeys` via the openai provider's managedCredentials. When the
env has CODEX_AUTH_JSON set, the auto-select "throws when no provider
keys are present" assertion finds it and fails to throw.

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Co-authored-by: pullfrog[bot] <226033991+pullfrog[bot]@users.noreply.github.com>

utils/apiKeys.test.ts

@@ -15,6 +15,7 @@ const savedEnv = { ...process.env };
 const STRIPPED_PREFIXES_OR_NAMES = [
   /_API_KEY$/,
   /^CLAUDE_CODE_OAUTH_TOKEN$/,
+  /^CODEX_AUTH_JSON$/,
   /^AWS_BEARER_TOKEN_BEDROCK$/,
   /^AWS_ACCESS_KEY_ID$/,
   /^AWS_SECRET_ACCESS_KEY$/,