fix: add codex and gemini-cli to ALLOWED_FAILURES in smoke tests

Both providers are failing on main due to upstream issues unrelated to
Goose code changes, blocking CI for all PRs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/test_providers_lib.sh

@@ -31,6 +31,8 @@ ALLOWED_FAILURES=(
   "openrouter:nvidia/nemotron-3-nano-30b-a3b"
   "openrouter:qwen/qwen3-coder:exacto"
   "openai:gpt-3.5-turbo"
+  "codex:gpt-5.2-codex"
+  "gemini-cli:gemini-2.5-pro"
 )
 
 AGENTIC_PROVIDERS=("claude-code" "codex" "gemini-cli" "cursor-agent")