fix(agent): raise tool rounds and ease calendar creates

Local models were burning the 8-round budget on simple event adds.
Raise the limit, resolve calendars by name/default, and inject the
household clock so relative dates work.

src/modules/agent/tool-executor.ts

@@ -111,8 +111,11 @@ async function dispatchTool(
       return callApi(request, origin, "GET", `/api/v1/events?${qs.toString()}`);
     }
     case "create_event": {
+      const resolved = await resolveCalendarId(args, request, origin);
+      if ("error" in resolved) return resolved.error;
+
       const body: Record<string, unknown> = {
-        calendarId: requireString(args, "calendarId"),
+        calendarId: resolved.calendarId,
         title: requireString(args, "title"),
         startAt: requireString(args, "startAt"),
         endAt: requireString(args, "endAt"),
@@ -375,6 +378,49 @@ async function dispatchTool(
   }
 }
 
+async function resolveCalendarId(
+  args: Record<string, unknown>,
+  request: Request,
+  origin: string,
+): Promise<{ calendarId: string } | { error: ApiCallResult }> {
+  const calendarId = typeof args.calendarId === "string" ? args.calendarId.trim() : "";
+  if (calendarId) return { calendarId };
+
+  const calendarsResult = await callApi(request, origin, "GET", "/api/v1/calendars");
+  if (calendarsResult.status !== 200 || !Array.isArray(calendarsResult.body)) {
+    return { error: calendarsResult };
+  }
+
+  const calendars = calendarsResult.body as Array<{ id?: string; name?: string }>;
+  const calendarName =
+    typeof args.calendarName === "string" ? args.calendarName.trim().toLowerCase() : "";
+
+  if (calendarName) {
+    const match = calendars.find(
+      (calendar) =>
+        typeof calendar.name === "string" && calendar.name.toLowerCase() === calendarName,
+    );
+    if (!match?.id) {
+      return {
+        error: {
+          status: 404,
+          body: {
+            error: `No calendar named "${args.calendarName}"`,
+            calendars: calendars.map((calendar) => ({ id: calendar.id, name: calendar.name })),
+          },
+        },
+      };
+    }
+    return { calendarId: match.id };
+  }
+
+  const first = calendars[0];
+  if (!first?.id) {
+    return { error: { status: 404, body: { error: "No calendars found" } } };
+  }
+  return { calendarId: first.id };
+}
+
 function requireString(args: Record<string, unknown>, key: string): string {
   const value = args[key];
   if (typeof value !== "string" || value.trim().length === 0) {