feat(lanes): add pipeline-template picker to the Workspace lane header

Lets a lane's pipeline template be switched live from the dashboard
(the same PATCH /api/lanes/:id the CLI's `ccam lanes pipeline` uses),
so lanes created before the picker shipped don't need the terminal.
Both ship-feature skills now force their own template before their
first `ccam stage` call, so the human never has to pick correctly at
lane creation.

client/src/pages/Workspace.tsx

@@ -132,6 +132,9 @@ export function Workspace() {
   const [addLaneOpen, setAddLaneOpen] = useState(false);
   const [viewedFeatureSlug, setViewedFeatureSlug] = useState<string | null>(null);
   const [features, setFeatures] = useState<LaneFeature[]>([]);
+  const [pipelineTemplates, setPipelineTemplates] = useState<
+    { id: string; name: string; nodes: { id: string }[] }[]
+  >([]);
   const [viewedFeature, setViewedFeature] = useState<LaneFeature | null>(null);
   const [proofFeatures, setProofFeatures] = useState<ProofFeature[]>([]);
 
@@ -202,7 +205,10 @@ export function Workspace() {
     api.run
       .binary()
       .then(setBinaryStatus)
-      .catch(() => setBinaryStatus({ found: false, path: null }));
+      // Fetch failure (server unreachable, proxy misrouted, etc.) isn't proof
+      // `claude` is missing from PATH — leave the probe unresolved rather than
+      // showing a misleading "claude missing" banner for an unrelated fault.
+      .catch(() => undefined);
     api.run
       .list()
       .then(setActiveRuns)
@@ -211,6 +217,10 @@ export function Workspace() {
       .history(50)
       .then((r) => setRunHistory(r.items))
       .catch(() => undefined);
+    api.lanes
+      .pipelines()
+      .then((r) => setPipelineTemplates(r.pipelines))
+      .catch(() => undefined);
     void refreshLanes();
     api.run
       .cwds()
@@ -856,6 +866,28 @@ export function Workspace() {
     }
   };
 
+  // Mirrors `ccam lanes pipeline <template> <id>`: same PATCH, same
+  // stage-mismatch warning when the current declared stage matches no node
+  // in the newly chosen template.
+  const handlePipelineChange = async (id: number, pipeline: string) => {
+    setLaneActionError(null);
+    try {
+      const { lane } = await api.lanes.update(id, { pipeline });
+      await refreshLanes();
+      if (!lane.pipeline_nodes.some((n) => n.state === "current")) {
+        setLaneActionError(
+          tLanes("pipelinePicker.stageMismatch", {
+            stage: lane.stage,
+            pipeline: lane.pipeline,
+            nodes: lane.pipeline_nodes.map((n) => n.id).join(", "),
+          })
+        );
+      }
+    } catch (err) {
+      setLaneActionError(err instanceof Error ? err.message : tLanes("actionErrorUnknown"));
+    }
+  };
+
   const consoleSection = (
     <>
       {/* Always attached under the pipeline - no header, no collapse. The
@@ -1036,7 +1068,28 @@ export function Workspace() {
             <span className="truncate text-sm font-semibold text-fg-primary">
               {currentLane.title || currentLane.cwd}
             </span>
-            <span className="text-[11px] text-fg-muted">{currentLane.pipeline_name}</span>
+            <select
+              data-testid="pipeline-picker"
+              aria-label={tLanes("pipelinePicker.label")}
+              className="rounded border border-border bg-surface-1 px-2 py-0.5 text-xs text-fg-secondary disabled:opacity-60"
+              value={currentLane.pipeline}
+              disabled={!!viewedFeature}
+              title={
+                viewedFeature
+                  ? tLanes("features.viewingArchived", { slug: viewedFeature.slug })
+                  : undefined
+              }
+              onChange={(e) => void handlePipelineChange(currentLane.id, e.target.value)}
+            >
+              {(pipelineTemplates.length
+                ? pipelineTemplates
+                : [{ id: currentLane.pipeline, name: currentLane.pipeline_name, nodes: [] }]
+              ).map((p) => (
+                <option key={p.id} value={p.id}>
+                  {p.nodes.length ? `${p.name} (${p.nodes.length})` : p.name}
+                </option>
+              ))}
+            </select>
             {/* `stage` defaults to the DB sentinel "idle" until the driving
                 session ever calls `ccam stage` — that string collides with
                 `status`'s own "idle"/"running" vocabulary, so a lane that is