Repair TUI ask viewport and scrollback accessibility

[Yeachan-Heo]

Internal TUI viewport/scrollback subsystem batch

Own concrete bugs #3674 and #3675 in one non-overlapping TUI repair lane, while preserving one PR per issue and separate issue/PR receipts.

#3674 — long command output cannot scroll back

The TUI command-output viewport can place initial lines above the visible viewport with no usable scrollback path. Reproduce the reported command-output surface and preserve ordinary output rendering, resize behavior, and keyboard/mouse scroll semantics.

#3675 — long ordinary ask premise is clipped

A normal non-Deep-Interview ask premise can exceed the terminal height while controls remain visible, leaving the beginning unreachable by Page Up/Page Down/Ctrl+U/Ctrl+D. Preserve selector/action usability, overflow affordances, mouse-wheel behavior, Deep Interview behavior, and narrow-width wrapping.

Ownership boundaries

• Current-dev base is the exact canonical dev head at lane creation.
• This lane is TUI viewport/scrollback only.
• Do not touch fix(tui): repair reentrant SDK callbacks and pipeline ownership #3665 NotificationServer, fix(coding-agent): retain deferred shell output #3660 deferred shell output, fix(session): complete descriptor-bound cleanup and live migration leases #3596, Repair current-dev shard-2 async queue and fork-context fixtures plus AI cache evidence #3670, or Repair Windows chat ownership settlement and integrate guard reconciliation #3676/fix(telegram): repair Windows ownership settlement #3679.
• Deliver [Bug] [TUI] Beginning of streaming assistant responses can be lost from native scrollback and replaced by stale tool output #3674 and [Bug] [ask] Long ordinary question premises are pushed above the viewport and cannot be scrolled #3675 as separate sequential PRs with independent tests, reviews, and merge receipts.
• No contributor branch mutation and no unrelated workflow reruns.

Acceptance

• Current-dev worktree and accepted prompt recorded.
• Source-grounded reproductions for both issues.
• Focused regression tests for viewport bounds, scroll reachability, resize, controls, mouse/keyboard semantics, and Deep Interview non-regression.
• Exact current-dev CI and hostile review for each PR separately.

—
[repo owner's gaebal-gajae (clawdbot) 🦞]

[Yeachan-Heo]

Accepted batch owner: issues #3674 and #3675 will be repaired sequentially in separate PRs. Worktree /tmp/gjc-repair-3680, branch repair/3680-tui-viewport, exact current-dev base e032869a34e57905e68ab55c8270a8050bc5ff21, raw tmux session gajae-code-issue-3680-tui-viewport, accepted prompt /tmp/accepted-prompt-3680.txt. Scope is TUI viewport/scrollback only and excludes #3665, #3660, #3596, #3670, #3676, and contributor branches.

—
[repo owner's gaebal-gajae (clawdbot) 🦞]

[Yeachan-Heo]

Canonical dev has advanced; the accepted TUI lane remains review-only until the owner refreshes its base to the exact current dev before mutation. Existing worktree is preserved without central edits. Separate #3674 then #3675 PRs remain required.

—
[repo owner's gaebal-gajae (clawdbot) 🦞]

[Yeachan-Heo]

PR #3684 is now merged to dev as eacf5345a1e9cf658a58f7cef0c06e79d4448e59 and closes #3674. Retire/supersede this batch owner for #3674 only; preserve the separate #3675 ordinary ask premise viewport backlog and do not mutate the owner worktree or branch from central review.

—
[repo owner's gaebal-gajae (clawdbot) 🦞]

[Yeachan-Heo]

PR #3686 is merged to dev as 4c6e817062fb5df230228f4cbc197f36c43594be; canonical dev must now be refreshed to that commit. The #3674 follow-up is complete. Reset this successor lane onto the merged dev and continue only the separate #3675 ordinary ask premise viewport backlog. Preserve one-PR-per-issue evidence and do not reopen #3674 work.

—
[repo owner's gaebal-gajae (clawdbot) 🦞]

[Yeachan-Heo]

GPT-heavy hostile triage receipt

receipt: terminal-accessibility/3680/2026-08-05

Disposition: CLOSE_COMPLETED — the bounded two-child coordination lane is terminal.

Exact current state

• dev: 732856b3ccb3fade6e9fbc17908a4fbca5a7682f
• current Dev CI: run 30935832940 — 22 success, 5 skipped, 3 failure
• primary failure is the unrelated coding-agent SDK operation-inventory assertion at packages/coding-agent/test/sdk-operation-inventory.test.ts:66, with downstream evidence/aggregate failures. It does not reopen either child lane.

Admission / duplicate / contributor ledger

• Admission: RESOLVED — this issue admitted and coordinated exactly [Bug] [TUI] Beginning of streaming assistant responses can be lost from native scrollback and replaced by stale tool output #3674 and [Bug] [ask] Long ordinary question premises are pushed above the viewport and cannot be scrolled #3675.
• Duplicate: NO — it is a completed coordination ticket, not a duplicate of either child issue.
• Contributor ledger (snowykr):
  • fix(tui): prevent transcript loss across reflows #3684 (#3674) — head 77a4b1d567c7213671045ce291a98ec4d2e38ca5, base 1ccb5f84350ad4e3f0be286e91ded6fc39982df5, merge eacf5345a1e9cf658a58f7cef0c06e79d4448e59; 22 success / 6 skipped / 0 non-green. Accepted and merged.
  • fix(tui): preserve restart admission after repaint failure #3686 (#3674 restart-admission follow-up) — head a753142e86f37e8a3bcba7d9126d1ad08a408e74, base eacf5345a1e9cf658a58f7cef0c06e79d4448e59, merge 4c6e817062fb5df230228f4cbc197f36c43594be; 14 success / 6 skipped / 0 non-green. Accepted and merged.
  • fix(ask): scroll ordinary question premises #3687 (#3675) — head 8fffb6fdfd1d28561bcf757f3ded93649151f2b6, base 4c6e817062fb5df230228f4cbc197f36c43594be, merge eef2afbd8f91a9ad4b79e6049b7e4cb2496bb4f8; 19 success / 6 skipped / 0 non-green. Accepted and merged.

All three merge commits are ancestors of current dev. Child issues #3674 and #3675 are both closed completed, and current source retains bounded/pageable ordinary ask premises plus the reviewed transcript/restart repairs.

Hostile boundary / current owner path

Closure is limited to this issue's explicit two-child scope. It does not claim that every generic native-scrollback heuristic is solved; #3705 remains the canonical open owner for the separate simultaneous off-screen displacement/visible-rewrite P1.

• Current owner path for Repair TUI ask viewport and scrollback accessibility #3680: none; batch lane retired.
• New regressions outside [Bug] [TUI] Beginning of streaming assistant responses can be lost from native scrollback and replaced by stale tool output #3674/[Bug] [ask] Long ordinary question premises are pushed above the viewport and cannot be scrolled #3675 must remain in their own issue/PR evidence chain rather than reopening this completed coordinator.

—
[repo owner's gaebal-gajae — GPT-heavy hostile triage]