feat: scheduled messages — schedule_reminder, send_later, list_scheduled, cancel_scheduled

- Broker: schedule/list_scheduled/cancel_scheduled WS message types + in-memory delivery
- Client: scheduleMessage(), listScheduled(), cancelScheduled() with resolver Map pattern
- MCP: schedule_reminder, send_later, list_scheduled, cancel_scheduled tools
- CLI: claudemesh remind <msg> --in 2h | --at 15:00 | list | cancel <id>
- Types: WSScheduleMessage, WSScheduledAckMessage, WSScheduledListMessage, WSCancelScheduledAckMessage

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/cli/src/commands/remind.ts

@@ -0,0 +1,134 @@
+/**
+ * `claudemesh remind <message> --in <duration> | --at <time>`
+ * `claudemesh remind list`
+ * `claudemesh remind cancel <id>`
+ *
+ * Human-facing interface to the broker's scheduled message delivery.
+ */
+
+import { withMesh } from "./connect";
+
+export interface RemindFlags {
+  mesh?: string;
+  in?: string;       // e.g. "2h", "30m", "90s"
+  at?: string;       // ISO or HH:MM
+  to?: string;       // default: self
+  json?: boolean;
+}
+
+function parseDuration(raw: string): number | null {
+  const m = raw.trim().match(/^(\d+(?:\.\d+)?)\s*(s|sec|m|min|h|hr|d|day)?$/i);
+  if (!m) return null;
+  const n = parseFloat(m[1]!);
+  const unit = (m[2] ?? "s").toLowerCase();
+  if (unit.startsWith("d")) return n * 86_400_000;
+  if (unit.startsWith("h")) return n * 3_600_000;
+  if (unit.startsWith("m")) return n * 60_000;
+  return n * 1_000;
+}
+
+function parseDeliverAt(flags: RemindFlags): number | null {
+  if (flags.in) {
+    const ms = parseDuration(flags.in);
+    if (ms === null) return null;
+    return Date.now() + ms;
+  }
+  if (flags.at) {
+    // Try HH:MM first
+    const hm = flags.at.match(/^(\d{1,2}):(\d{2})$/);
+    if (hm) {
+      const now = new Date();
+      const target = new Date(now);
+      target.setHours(parseInt(hm[1]!, 10), parseInt(hm[2]!, 10), 0, 0);
+      if (target <= now) target.setDate(target.getDate() + 1); // next occurrence
+      return target.getTime();
+    }
+    const ts = Date.parse(flags.at);
+    return isNaN(ts) ? null : ts;
+  }
+  return null;
+}
+
+export async function runRemind(
+  flags: RemindFlags,
+  positional: string[],
+): Promise<void> {
+  const useColor = !process.env.NO_COLOR && process.env.TERM !== "dumb" && process.stdout.isTTY;
+  const dim = (s: string) => (useColor ? `\x1b[2m${s}\x1b[22m` : s);
+  const bold = (s: string) => (useColor ? `\x1b[1m${s}\x1b[22m` : s);
+
+  const action = positional[0];
+
+  // claudemesh remind list
+  if (action === "list") {
+    await withMesh({ meshSlug: flags.mesh ?? null }, async (client) => {
+      const scheduled = await client.listScheduled();
+      if (flags.json) { console.log(JSON.stringify(scheduled, null, 2)); return; }
+      if (scheduled.length === 0) { console.log(dim("No pending reminders.")); return; }
+      for (const m of scheduled) {
+        const when = new Date(m.deliverAt).toLocaleString();
+        const to = m.to === client.getSessionPubkey() ? dim("(self)") : m.to;
+        console.log(`  ${bold(m.id.slice(0, 8))} → ${to} at ${when}`);
+        console.log(`  ${dim(m.message.slice(0, 80))}`);
+        console.log("");
+      }
+    });
+    return;
+  }
+
+  // claudemesh remind cancel <id>
+  if (action === "cancel") {
+    const id = positional[1];
+    if (!id) { console.error("Usage: claudemesh remind cancel <id>"); process.exit(1); }
+    await withMesh({ meshSlug: flags.mesh ?? null }, async (client) => {
+      const ok = await client.cancelScheduled(id);
+      if (ok) console.log(`✓ Cancelled ${id}`);
+      else { console.error(`✗ Not found or already fired: ${id}`); process.exit(1); }
+    });
+    return;
+  }
+
+  // claudemesh remind <message> --in <duration> | --at <time>
+  const message = action ?? positional.join(" ");
+  if (!message) {
+    console.error("Usage: claudemesh remind <message> --in <duration>");
+    console.error("       claudemesh remind <message> --at <time>");
+    console.error("       claudemesh remind list");
+    console.error("       claudemesh remind cancel <id>");
+    process.exit(1);
+  }
+
+  const deliverAt = parseDeliverAt(flags);
+  if (deliverAt === null) {
+    console.error('Specify when: --in <duration> (e.g. "2h", "30m") or --at <time> (e.g. "15:00")');
+    process.exit(1);
+  }
+
+  await withMesh({ meshSlug: flags.mesh ?? null }, async (client) => {
+    // Determine target: --to flag or self
+    let targetSpec: string;
+    if (flags.to && flags.to !== "self") {
+      if (flags.to.startsWith("@") || flags.to === "*" || /^[0-9a-f]{64}$/i.test(flags.to)) {
+        targetSpec = flags.to;
+      } else {
+        const peers = await client.listPeers();
+        const match = peers.find((p) => p.displayName.toLowerCase() === flags.to!.toLowerCase());
+        if (!match) {
+          console.error(`Peer "${flags.to}" not found. Online: ${peers.map((p) => p.displayName).join(", ") || "(none)"}`);
+          process.exit(1);
+        }
+        targetSpec = match.pubkey;
+      }
+    } else {
+      targetSpec = client.getSessionPubkey() ?? "*";
+    }
+
+    const result = await client.scheduleMessage(targetSpec, message, deliverAt);
+    if (!result) { console.error("✗ Broker did not acknowledge — check connection"); process.exit(1); }
+
+    if (flags.json) { console.log(JSON.stringify(result)); return; }
+    const when = new Date(result.deliverAt).toLocaleString();
+    const toLabel = !flags.to || flags.to === "self" ? "yourself" : flags.to;
+    console.log(`✓ Reminder set (${result.scheduledId.slice(0, 8)}): "${message}" → ${toLabel} at ${when}`);
+  });
+}