P9-1 Library 의 ? 키 활성화. App.ask slot 채움 (parallel-safety contract
그대로). Worker thread 가 kebab-app::ask_with_config 호출하면서
AskOpts.stream_sink 로 token 을 mpsc 채널 에 보냄, 메인 스레드 (TUI) 는
매 render frame 마다 drain 으로 문자열 누적 → 답변 영역 이 token-by-token
업데이트.

핵심:
- AskState 본체 (`app.rs`) — input / explain / streaming / partial /
  answer / thread JoinHandle / rx Receiver / scroll / last_error.
- `src/ask.rs`:
  - `render_ask` — input bar / 답변 영역 (streaming 시 ▍ cursor) /
    bottom split (status: grounded/model/prompt/k/refusal · citations
    or explain panel).
  - `handle_key_ask`: typing → input. Enter → spawn_ask_worker (input
    있음 + not streaming). e (input empty 시) → toggle explain.
    j/k (input empty 시) → scroll. Esc → SwitchPane(Library) +
    streaming/rx/thread 클리어 (best-effort cancel).
  - `spawn_ask_worker` — mpsc::channel + thread::spawn(|| ask_with_config).
  - run-loop hooks: `drain_stream` (try_iter → partial), `poll_worker`
    (handle.is_finished → take + join → answer 채움 또는 ErrorOverlay).
- run.rs: Pane::Ask arm 이 handle_key_ask + render_ask. Idle tick 마다
  drain_stream + poll_worker. SwitchPane(Ask) 시 lazy init.

테스트 13개 (`tests/ask.rs`) — Esc/typing/backspace/e toggle (input
empty)/e typed (input nonempty)/Enter empty/Enter while streaming
no-op/render pre-submission hint/streaming partial+cursor/grounded
answer + citation [1]/refusal score_gate 패널 panic 없음/explain panel
title flip/no slot.

Spec deviation (HOTFIXES `2026-05-02 P9-3`):
- `render_ask<B: Backend>` generic 제거 — ratatui 0.28 Frame
  backend-agnostic (P9-1/P9-2 와 동일).
- e/j/k 가 input 빈 상태 일 때만 command 키, 입력 있으면 typing —
  vim "command vs insert" 변형. spec literal 의 단순 \"e=toggle\" 은
  \"explain\" / \"javascript\" 같은 단어 입력 깨뜨림.

Docs (sync rule):
- README: TUI 행 \"Library + Search + Ask 패널\" + Quick start 코멘트.
- HANDOFF: 한 줄 요약 + Phase status (P9 2/5 → 3/5) + deviation 한 줄.
- HOTFIXES: P9-3 entry.
- tasks/p9/p9-3 status: completed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

@@ -92,8 +92,35 @@ impl Default for SearchState {
     }

@@ -0,0 +317,4 @@
+    match result {
+        Ok(Ok(answer)) => {
+            // Final partial is the full answer text; replace partial
+            // with the canonical answer.answer so post-stream rendering

@@ -0,0 +347,4 @@
+/// thread which would touch SQLite + LanceDB + Ollama. Tests bypass it
+/// by hand-populating `AskState` and asserting render / key handler
+/// behavior directly.
+#[cfg(any(test, doc))]

@@ -61,6 +62,13 @@ pub(crate) fn run_loop(app: &mut App) -> Result<()> {
                         }
                     }
                 }
+                Pane::Ask => {

@@ -17,0 +20,4 @@
+
+**Symptom 1 (cosmetic)**: Same shape as P9-1 / P9-2 — `tasks/p9/p9-3-tui-ask.md` § Public surface declares `render_ask<B: ratatui::backend::Backend>(...)`. ratatui 0.28's `Frame` is backend-agnostic; the generic is unused and clippy `-D warnings` rejects it.
+
+**Symptom 2 (load-bearing)**: Spec key bindings list `e` (toggle explain), `j` / `k` (scroll). All three collide with typing — a user asking "explain javascript" would have the leading `e` toggle explain mode, then `j` scroll, etc. The Library / Search panes don't hit this because their input is either filter-overlay-gated (Library) or the whole pane *is* an input (Search). Ask has both an always-visible input bar AND scrollable answer area.

@@ -0,0 +181,4 @@
+                    Span::raw(c.citation.to_uri()),
+                ])
+            })
+            .collect(),

@@ -0,0 +330,4 @@
+        return;
+    }
+    let handle = s.thread.take().expect("just confirmed Some");
+    let result = handle.join();

@@ -0,0 +319,4 @@
+            (0..buffer.area.width)
+                .map(|x| buffer[(x, y)].symbol())
+                .collect::<String>()
+        })