ci: add GitHub Actions workflow for auto-deploy via rsync

fix: remove Download/TestFlight buttons since no release exists yet

fix: hero buttons not clickable due to bg-grid overlay

feat: sync multi-agent support from ShellCast app and recapture screenshots

fix: show Claude Tmux instead of Tmux Browser on homepage screenshots

refactor: show 4 key screenshots on homepage, full gallery on features page

fix: use auto-fill grid for screenshots to handle 7 items cleanly

feat: add tmux browser and Claude Code screenshots from live connection

feat: add Claude Code support feature and refresh screenshots

docs: add last sync commit reference to ShellCast app (4d09781)

docs: add README with project overview and dev instructions

feat: initial ShellCast marketing website