- Replaced the streaming edit diff rendering strategy with a fixed-height trailing window so partial re-diff streams stayed anchored and stopped oscillating.
- Updated streaming preview tests to assert the window remained saturated without trailing blank padding across chunked updates and still produced a real diff after finalization.
- Tuned TUI viewport repaint heuristics for pure appends and multiplexer sessions, and adjusted render-stress handling for preserved tmux scrollback.
- Added overlayRebuild intent, refactored forced-frame prep around base lines, and added frame dump support.
- Updated forced-render prep to preserve forced flags, allow unknown viewport mutation, and clear scrollback on resize.
- Introduced #syncChildOrder for child attach/reorder and skipped duplicate checks when after.atBottom was false.
- Added streaming-preview test scaffolding with VirtualTerminal, settleTerminal draining, and normalized row helpers.
- Added +Nk/+Nm turn-budget parsing with whitespace-boundary matching, multipliers, and hard `!` indicator.
- Added per-turn budget lifecycle plus APIs (`getTurnBudget`, `recordEvalSubagentUsage`) and hard-cap checks in eval runs.
- Added hard budget observability in eval preludes and docs by exposing `budget.hard` and documenting ceiling modes.
- Fixed streaming preview stutter with max-row tracking and padding, with tests for preview height and budget parsing.
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