- Added tail-only transcript rendering via `renderViewportTail`, stopping at `maxRows` and returning `EMPTY_TAIL`.
- Added `ViewportTailProvider`/`asViewportTailProvider` API and resize getters for viewport state.
- Implemented viewport-only painting during non-mux resize with deferred full repaint after settle.
- Added settle-resize helpers and coverage for deferred repaint timing and cancel paths.
- Added commit-stability signaling to transcript blocks and marked tool previews as unstable until expanded or finalized.
- Updated transcript scrollback promotion to derive live commit state only for blocks reporting commit-stable rows.
- Added tests ensuring provisional pending edit previews are never committed while durable live rows still promote after the stability window.
- Added transcript and assistant block version tracking for finalized segments.
- Changed committed block reuse logic to require prior finalization and same version.
- Fixed rerendering of committed finalized blocks when version values changed.
- Removed terminal risk mode toggles from config, terminal state collection, and render controllers.
- Dropped snapshot freezing, thaw tracking, and finalized-block replay in transcript rendering.
- Removed clear-on-shrink settings and initialization hooks from selector and interactive mode flows.
- Simplified render scheduling by using requestRender() without mutation flags or stream checkpoints.
- Added `isUserInterruptAbort` and `shouldRenderAbortReason` helpers so interrupt handling can distinguish Esc-based aborts from other abort reasons.
- Updated assistant transcript rendering to suppress the `Interrupted by user` line while continuing to show generic or other abort labels.
- Updated plan-review and transcript container tests to assert interrupted assistant messages no longer render the redundant interrupt line.
- Added optional `reason` parameters to `Agent.abort` and `AgentSession.abort` APIs.
- Passed abort reasons through interrupt flows into underlying agent cancellation.
- Replaced hard-coded abort text with `resolveAbortLabel` for streaming and replayed messages.
- Fell back to generic `Request was aborted` text when no abort reason was provided.
- Centralized transcript spacing by stripping blank edges and inserting separators.
- Removed per-component leading spacers and empty placeholders that added extra gaps.
- Introduced TranscriptBlock grouping so related outputs render as single transcript children.
- Updated transcript-related tests to validate one-row block separators and blank-line trimming.
- Shared immutable model registries and auth storage via beforeAll/afterAll.
- Swapped fixed-delay settle sleeps for predicate polling and signals.
- Stubbed network/timers to drop wall-clock waits in registry and history tests.
- Added resetDisplay invalidation tests and startup-timing breakdown lines.
- Cleared native scrollback on `omp`/`omp -c` so the resumed transcript no longer stacks on the prior run's welcome screen.
- Tracked assistant block finalization so aborted streaming messages stay repaintable when status rows land beneath them on ED3-risk terminals.
- Replaced bottom-most-block liveness with a finalization check so the live region spans every still-mutating block.
- Kept unfinalized tools repaintable when out-of-band inserts append finalized blocks below them.
- Recomputed blocks as they cross out of the live region to seal their final content.
- Added `NativeScrollbackLiveRegion` seam so components report the live suffix start.
- Stopped ED3-risk streaming from dropping sealed transcript rows above the live block.
- Appended newly sealed rows once while keeping the active tail deferred to checkpoint.
- Added NativeScrollbackLiveRegion seam reporting where a component's transient suffix begins.
- Pinned the live block and chrome below it out of native history during foreground streams on ED3-risk terminals.
- Consumed pending forced scrollback wipes while pinned to avoid yanking a scrolled-up reader (#1682).
- Tracked the previous live child in TranscriptContainer and forced a one-off recompute when a block leaves live status.
- Skipped snapshot reuse for that transitioning block so coalesced finalize-and-append frames seal transcript blocks at their final content.
- Added a regression test covering the stale-prefix freeze case on ED3-risk terminals and confirming the frozen block stays unchanged until thaw.
- Added assistant-message completion state and stable-line count reporting.
- Added transcript stable-row aggregation and snapshot replay to keep unstable rows out of scrollback.
- Added TUI stable scrollback boundary APIs and stable-prefix commit path.
- Added regression tests proving unstable rows stay out of scrollback until stabilized.
- Added TranscriptContainer that snapshots non-live blocks to avoid stale scrollback duplicates.
- Thawed snapshots at prompt-submit checkpoints for reconciliation.
- Repainted eager streaming tail on overflowing shrink to unfreeze UI (issue #1682).
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