append-only insertions above the floor no longer arm a permanent promotion freeze; floor index travels with the insertion; documented the floor semantics in the renderer internals doc.
- Introduced a stable-prefix ratchet in `deriveLiveCommitState` for 30-frame row stability.
- Computed `safeLength` from the stable prefix when `appendOnly` is false so static heads reach scrollback.
- Persisted stable-prefix/candidate state in `LiveDiffSnapshot` and `LiveCommitState` for boundary retreat on rewrites.
- Added committed-prefix resync and audited prefix tracking for terminal recovery.
- Fixed committed-row retention during resize/shrink so stale rows stay in scrollback.
- Fixed inline image demotion to preserve fallback block height using rendered graphic rows.
- Updated render regressions and stress harness expectations for resync parity and stale-prefix behavior.
- Added virtual-terminal event-log compaction and replay recovery handling for OOM resilience.
- Handled frame shrink by re-anchoring windowTop and chunkTo at commit boundaries.
- Reset committedRows when the frame shrank into committed content to keep history immutable.
- Treated geometryChanged like overlay when advancing chunkTo to stabilize repaint commit timing.
- Updated regressions to assert stable scrollback prefixes and no clear-home/dclear repaint bytes.
- 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.
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