hand a ticket to Claude from the sidebar (T-327)

Hovering a ticket card reveals a person-simple-run icon; clicking it
fetches the full ticket (pql.tickets.show withContext), builds a "pick
this up and start" prompt, and publishes ('builtin.tickets','pick-up',
{id,prompt}) on the message bus. The Claude builtin subscribes and
injects it into the active session (primary, else first visible) as a
user turn — a quiet no-op when no session is live. Sidebar stays
decoupled from the orchestrator (bus-only). Prompt-builder test.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

test/builtin/tickets/pick_up_prompt_test.dart

@@ -0,0 +1,37 @@
+/// The "pick up this ticket" prompt builder (T-327): lead-in, header, meta
+/// line, and description, with missing fields omitted gracefully.
+library;
+
+import 'package:clide/builtin/tickets/src/pick_up_prompt.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  test('renders the lead-in, header, meta line, and description', () {
+    final p = pickUpPrompt({
+      'id': 'T-327',
+      'title': 'Pick up icon',
+      'type': 'story',
+      'status': 'ready',
+      'priority': 'medium',
+      'parent_id': 'T-276',
+      'description': 'Do the thing.',
+    });
+    expect(p, startsWith('Pick up and start working this ticket'));
+    expect(p, contains('**T-327 — Pick up icon**'));
+    expect(p, contains('story · ready · medium · parent T-276'));
+    expect(p, contains('Do the thing.'));
+  });
+
+  test('omits the meta line and parent when those fields are absent', () {
+    final p = pickUpPrompt({'id': 'T-1', 'title': 'Bare'});
+    expect(p, contains('**T-1 — Bare**'));
+    expect(p, isNot(contains('·')));
+    expect(p, isNot(contains('parent')));
+  });
+
+  test('includes the decision ref and assignee when present', () {
+    final p = pickUpPrompt({'id': 'T-2', 'title': 'x', 'decision_ref': 'D-90', 'assigned_to': 'jeroen'});
+    expect(p, contains('D-90'));
+    expect(p, contains('@jeroen'));
+  });
+}