v2.12.0

Added

• Pi extension - Added optional Pi browser tools backed by Surf's native-host socket, plus optional pi-subagents background reporting for session-owned oracle jobs.
• Rendered page HTML - Added surf page.html to print and surf page.save --output <path> to save the current rendered document HTML, with --selector <css> and --strip-scripts for bounded static exports of Claude artifacts or other rendered pages.
• Playbook script strategies - Added opt-in trusted read-op scripts with dynamic tools.run/tools.all Surf tool orchestration and workflow auto-waits.

Changed

• TypeScript boundary cleanup - Replaced content element ref expandos with a WeakMap and validated native API stream response frames before dispatch.