Align Assistant prompt history recall

docs/release-control/v6/internal/subsystems/ai-runtime.md

@@ -123,8 +123,14 @@ runtime cost control, and shared AI transport surfaces.
    may persist a bounded local history of submitted prompt text and structured
    mentions for ArrowUp/ArrowDown recall, but that history must not persist or
    replay one-shot finding handoff, approval, autonomous-mode, or other scoped
-   send options. Scoped context replay remains owned by explicit session
-   handoff metadata or queued follow-up edit state.
+   send options. The referenced OpenCode source at fetched `origin/dev` commit
+   `ba57718b0516c7a8670d1e820b1a24146a8b8262` binds prompt history navigation
+   in `packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx` to the
+   input cursor boundary: previous history is available at the start of the
+   current draft, and next history restores the saved draft at the end. Pulse's
+   Assistant drawer follows that draft-safe recall model rather than limiting
+   history recall to an empty composer. Scoped context replay remains owned by
+   explicit session handoff metadata or queued follow-up edit state.
    Failed-turn retry is part of that same local chat-runtime boundary: a
    retryable in-memory assistant error may replay the original user turn's
    structured mentions, finding id, approval override, handoff resources,

frontend-modern/src/components/AI/Chat/__tests__/AIChat.test.tsx

@@ -1332,7 +1332,7 @@ describe('AIChat', () => {
       await waitFor(() => expect(textarea.value).toBe(''));
     });
 
-    it('does not replace a non-empty composer draft with prompt history', () => {
+    it('recalls prompt history from the start of a draft and restores the draft', async () => {
       localStorage.setItem(
         'pulse:ai_chat_prompt_history',
         JSON.stringify([{ prompt: 'previous prompt', mentions: [] }]),
@@ -1344,9 +1344,14 @@ describe('AIChat', () => {
       ) as HTMLTextAreaElement;
 
       fireEvent.input(textarea, { target: { value: 'draft prompt' } });
+      textarea.setSelectionRange(0, 0);
       fireEvent.keyDown(textarea, { key: 'ArrowUp' });
 
-      expect(textarea.value).toBe('draft prompt');
+      await waitFor(() => expect(textarea.value).toBe('previous prompt'));
+
+      fireEvent.keyDown(textarea, { key: 'ArrowDown' });
+
+      await waitFor(() => expect(textarea.value).toBe('draft prompt'));
     });
 
     it('loads persisted prompt history for recall', async () => {

frontend-modern/src/components/AI/Chat/index.tsx

@@ -592,7 +592,7 @@ export const AIChat: Component<AIChatProps> = (props) => {
     const cursor = textareaRef.selectionStart ?? text.length;
     const inHistory = promptHistoryIndex() >= 0;
     if (inHistory) return cursor === 0 || cursor === text.length;
-    if (direction === 'up') return cursor === 0 && text.length === 0;
+    if (direction === 'up') return cursor === 0;
     return false;
   };