[READ-ONLY] Mirror of https://github.com/bombshell-dev/tty. Platform independent 2D layout engine for terminal applications based on Clay bomb.sh/docs/tty

📝 add scroll specification and implementation master

Introduces specs/scroll-spec.md (v0.2) with caller-owned scroll model. Clip API changes from { horizontal, vertical } to { x?, y? } with numeric offsets. Adds scrollDelta on ElementInfo for wheel delta reporting. Adds RenderOptions.event for input event integration. Includes scroll demo with ~10k lines of lorem markdown.