Support multiple API keys via `api_keys` array in config or `OCGO_API_KEYS`
env var. On HTTP 429, automatically rotate to the next key and retry.
Key index persisted to `~/.config/ocgo/key-index` for restart safety.
Backward compatible with existing single-key `api_key` configs.
Fixes#115
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Forward streamed tool call deltas for both Claude and Codex launch paths, preserve call IDs across tool results, and replay DeepSeek reasoning_content when required after tool execution.
Fixes https://github.com/emanuelcasco/ocgo/issues/1
