- Enabled DEC 2026 for Alacritty/VS Code and via TERM_FEATURES Sy token.
- Stopped blanket-disabling SSH for recognized direct terminals.
- Made the DECRQM probe enable sync on a positive report, not just disable.
- Extracted synchronizedOutputUserOverride so opt-out beats force-on.
Changed text row repaints to overwrite first and clear only stale suffixes so non-synchronized WSL/Windows Terminal paints do not visibly blank already-rendered rows. Kept full-line pre-clears for image protocol rows and preserved exact-width row handling.\n\nFixes #2011
- Added tui-core-renderer.md covering yank/corruption/flash/width faults.
- Linked the new doc from runtime internals and the tui.ts header.
- Refreshed runtime-internals to match current boot and render-intent flow.