own /effort: respawn-with-resume carrying --effort, picker UX (T-412)

Spike result (probed claude 2.1.175 over stream-json): there is NO
set_effort/set_thinking_effort control subtype — both are rejected. The
lever is the `--effort <level>` spawn flag (low/medium/high/xhigh/max;
settings.json effortLevel is the persisted default). So changing effort
restarts the process: respawn-with-resume keeps the conversation and
carries the flag — the same continuity /clear and /resume already rely on.

- SpawnSpec.effort → orchestrator appends `--effort <level>`.
- claude_pane: /effort <level> validates and respawns (toast explains the
  restart); bare /effort opens a picker; the pane re-applies its effort on
  every later respawn. Invalid level → local notice listing levels.
- ModelPickerCard generalised minimally (title + isCurrent predicate) so
  the effort picker reuses it; effort needs exact matching because `high`
  is a substring of `xhigh` and alias-containment would mis-mark it.
- SessionStatus.effort + StreamJsonSession.noteEffort: the wire never
  reports effort, so the spawner records what it set; status/sidebar read
  it from the normal status stream.
- Routing: effort moves from the TUI-only catalog to kClideOwnedCommands.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/builtin/claude/src/model_picker_card.dart

@@ -25,7 +25,15 @@ bool modelOptionIsCurrent(ModelOption option, String? currentModel) {
 }
 
 class ModelPickerCard extends StatefulWidget {
-  const ModelPickerCard({super.key, required this.models, this.currentModel, required this.onPick, required this.onCancel});
+  const ModelPickerCard({
+    super.key,
+    required this.models,
+    this.currentModel,
+    required this.onPick,
+    required this.onCancel,
+    this.title = 'model',
+    this.isCurrent = modelOptionIsCurrent,
+  });
 
   /// Selectable entries, in display order. Callers pass [kFallbackModels]
   /// when the session hasn't reported its list yet.
@@ -40,6 +48,15 @@ class ModelPickerCard extends StatefulWidget {
   /// Called when the user dismisses the picker without choosing.
   final VoidCallback onCancel;
 
+  /// Header label. The /effort picker reuses this card with its own title
+  /// and an exact-match [isCurrent] (T-412).
+  final String title;
+
+  /// Marks the active entry. The model default ([modelOptionIsCurrent]) also
+  /// alias-matches (`sonnet` ⊂ `claude-sonnet-4-6`); effort needs exact match
+  /// (`high` would falsely match inside `xhigh`).
+  final bool Function(ModelOption option, String? current) isCurrent;
+
   @override
   State<ModelPickerCard> createState() => _ModelPickerCardState();
 }
@@ -49,7 +66,7 @@ class _ModelPickerCardState extends State<ModelPickerCard> {
 
   int _initialHighlight() {
     for (var i = 0; i < widget.models.length; i++) {
-      if (modelOptionIsCurrent(widget.models[i], widget.currentModel)) return i;
+      if (widget.isCurrent(widget.models[i], widget.currentModel)) return i;
     }
     return 0;
   }
@@ -130,7 +147,7 @@ class _ModelPickerCardState extends State<ModelPickerCard> {
           children: [
             Row(
               children: [
-                ClideText('model', fontSize: clideFontSmall, fontFamily: clideMonoFamily, color: tokens.statusInfo),
+                ClideText(widget.title, fontSize: clideFontSmall, fontFamily: clideMonoFamily, color: tokens.statusInfo),
                 const Spacer(),
                 ClideText('↑↓ · 1-${widget.models.length} · Enter · Esc', fontSize: clideFontMeta, fontFamily: clideMonoFamily, color: tokens.globalTextMuted),
               ],
@@ -152,7 +169,7 @@ class _ModelPickerCardState extends State<ModelPickerCard> {
 
   Widget _row(SurfaceTokens tokens, int i) {
     final m = widget.models[i];
-    final current = modelOptionIsCurrent(m, widget.currentModel);
+    final current = widget.isCurrent(m, widget.currentModel);
     final highlighted = i == _highlight;
     return Padding(
       padding: const EdgeInsets.only(bottom: 4),