Improvements

• GitHub AI Writer watches pull requests, detects documentation needing updates, and drafts changes on a review branch with a summary comment posted to the PR.
• The new @readme/cli lints docs, syncs OpenAPI specs, previews locally, and sets up CI in a single command.
• Admin experience redesigned into a unified collapsible sidebar with nested group panels and persisted collapse state.
• New MDX-ish rendering engine combines Markdown, HTML, and JSX in the same document, available by default on new projects.
• Claude Opus 4.7 and GPT-5.5 are now available for the AI Agent and Ask AI.