loops wizard: expose 'until' repeat policy

Third radio option on the repeat step. Two inputs: event name (defaults
to 'ok') and a within_iters cap (defaults to 20). Ships the full
{kind: 'until', event, within_iters} payload the schema already accepts.
LoopsCanvas repeat summary now formats iters/until/infinite via one
helper — the previous inline expression was rendering 'until' as a bare
label with no event context.

frontend/src/components/dashboard/LoopsWizard.tsx

@@ -36,8 +36,12 @@ export function LoopsWizard({
   const [cron, setCron] = useState("0 */6 * * *");
   const [onCompletion, setOnCompletion] = useState(false);
   const [webhookEnabled, setWebhookEnabled] = useState(false);
-  const [repeatKind, setRepeatKind] = useState<"infinite" | "iters">("infinite");
+  const [repeatKind, setRepeatKind] = useState<"infinite" | "iters" | "until">(
+    "infinite",
+  );
   const [iters, setIters] = useState(10);
+  const [untilEvent, setUntilEvent] = useState("ok");
+  const [untilWithin, setUntilWithin] = useState(20);
   const [submitting, setSubmitting] = useState(false);
   const [submitError, setSubmitError] = useState<string | null>(null);
   const [created, setCreated] = useState<LoopCreated | null>(null);
@@ -60,10 +64,24 @@ export function LoopsWizard({
         setSubmitting(false);
         return;
       }
-      const repeat_policy: LoopRepeatPolicy =
-        repeatKind === "infinite"
-          ? { kind: "infinite" }
-          : { kind: "iters", n: Math.max(1, Math.floor(iters)) };
+      let repeat_policy: LoopRepeatPolicy;
+      if (repeatKind === "infinite") {
+        repeat_policy = { kind: "infinite" };
+      } else if (repeatKind === "iters") {
+        repeat_policy = { kind: "iters", n: Math.max(1, Math.floor(iters)) };
+      } else {
+        const event = untilEvent.trim();
+        if (!event) {
+          setSubmitError("Until: event name is required");
+          setSubmitting(false);
+          return;
+        }
+        repeat_policy = {
+          kind: "until",
+          event,
+          within_iters: Math.max(1, Math.floor(untilWithin)),
+        };
+      }
       const out = await createLoop({
         title: title.trim(),
         description: description.trim(),
@@ -260,6 +278,69 @@ export function LoopsWizard({
                   />
                 )}
               </label>
+              <label style={radioRowStyle(repeatKind === "until")}>
+                <input
+                  type="radio"
+                  checked={repeatKind === "until"}
+                  onChange={() => setRepeatKind("until")}
+                />
+                <div style={{ flex: 1 }}>
+                  <div style={{ fontWeight: 600, color: "#f3f3f5" }}>Until event</div>
+                  <div style={hintStyle}>
+                    Stop the first time an iteration emits the named run event.
+                    Give up after the iteration cap regardless.
+                  </div>
+                  {repeatKind === "until" && (
+                    <div
+                      style={{
+                        display: "grid",
+                        gridTemplateColumns: "1fr 120px",
+                        gap: 8,
+                        marginTop: 8,
+                      }}
+                    >
+                      <label
+                        style={{
+                          display: "flex",
+                          flexDirection: "column",
+                          gap: 4,
+                        }}
+                      >
+                        <span style={{ ...hintStyle, fontSize: 10, letterSpacing: ".1em", textTransform: "uppercase" }}>
+                          Event
+                        </span>
+                        <input
+                          type="text"
+                          value={untilEvent}
+                          placeholder="ok"
+                          onChange={(e) => setUntilEvent(e.target.value)}
+                          style={fieldStyle}
+                        />
+                      </label>
+                      <label
+                        style={{
+                          display: "flex",
+                          flexDirection: "column",
+                          gap: 4,
+                        }}
+                      >
+                        <span style={{ ...hintStyle, fontSize: 10, letterSpacing: ".1em", textTransform: "uppercase" }}>
+                          Cap
+                        </span>
+                        <input
+                          type="number"
+                          value={untilWithin}
+                          min={1}
+                          onChange={(e) =>
+                            setUntilWithin(parseInt(e.target.value, 10) || 1)
+                          }
+                          style={fieldStyle}
+                        />
+                      </label>
+                    </div>
+                  )}
+                </div>
+              </label>
               {submitError && (
                 <p style={{ fontFamily: mono, fontSize: 12, color: "#ff8a7a" }}>
                   {submitError}