Claude Opus 5.5

Anthropic has updated its Claude foundation models documentation to reflect the release of Claude Opus 5.5, replacing references to the previous Opus 5 model in code examples and API specifications. The update changes model identifiers from `.opus5` (claude-opus-5) to `.opus5_5` (claude-opus-5-5) throughout the Swift package documentation, while maintaining that these dateless model IDs are pinned snapshots rather than evergreen pointers.