Let the agent set the merge commit title, defaulting to the task title

web/dist/state.js

@@ -130,6 +130,7 @@ export function handleEvent(ev) {
             void loadProjects();
             break;
         case "task.created":
+        case "task.merge_title":
         case "task.merged":
         case "task.discarded":
             if (ev.project_id) {

web/dist/task.js

@@ -93,7 +93,7 @@ export function mountTranscript(root) {
         const target = state.projects.find((p) => p.id === task.project_id)?.default_branch ?? "the default branch";
         const busy = sess?.state === "running" || sess?.state === "queued";
         const merge = h("button", { disabled: busy, title: `The agent merges ${target} in, then byre squashes into one commit on ${target}; nothing is pushed` }, "Merge");
-        merge.onclick = () => confirmChanges(task, (u) => `Merge "${task.title}" into ${target}? The agent first merges ${target} in and resolves any conflicts; when that turn ends, ${changesText(u)} become one commit on ${target} and the task closes. Nothing is pushed.`, async () => {
+        merge.onclick = () => confirmChanges(task, (u) => `Merge "${task.title}" into ${target}? The agent first merges ${target} in and resolves any conflicts; when that turn ends, ${changesText(u)} become one commit on ${target} titled "${task.merge_title}", and the task closes. Nothing is pushed.`, async () => {
             await post("/api/tasks/{taskId}/merge", { path: { taskId: task.id } });
         });
         const mergeIn = h("button", { disabled: busy, title: `Ask the agent to merge ${target} into this branch and resolve any conflicts` }, `Merge ${target} in`);
@@ -604,6 +604,8 @@ function renderEvent(ev, ctx) {
             }
             return null;
         }
+        case "task.merge_title":
+            return h("div", { class: "note" }, `${ev.actor} set the merge commit title to "${String(p["merge_title"])}" `, when);
         case "task.merged":
             return h("div", { class: "note" }, `${ev.actor} merged the task${p["commit"] ? ` as ${String(p["commit"]).slice(0, 7)}` : ""} `, when);
         case "task.discarded":