feat: Add WhatsApp poll support (#248)

Implements issue #123 - WhatsApp Poll Support

## Gateway Protocol
- Add `poll` RPC method with params: to, question, options (2-12), selectableCount

## ActiveWebListener
- Add `sendPoll(to, poll)` method to interface
- Implementation uses Baileys poll message type

## CLI Command
- `clawdbot poll --to <jid> -q <question> -o <opt1> -o <opt2> [-s count]`
- Supports --dry-run, --json, --verbose flags
- Validates 2-12 options

## Changes
- src/gateway/protocol/schema.ts: Add PollParamsSchema
- src/gateway/protocol/index.ts: Export validator and types
- src/web/active-listener.ts: Add sendPoll to interface
- src/web/inbound.ts: Implement sendPoll using Baileys
- src/web/outbound.ts: Add sendPollWhatsApp function
- src/gateway/server-methods/send.ts: Add poll handler
- src/commands/poll.ts: New CLI command
- src/cli/program.ts: Register poll command

Closes #123

src/commands/poll.ts

@@ -0,0 +1,73 @@
+import type { CliDeps } from "../cli/deps.js";
+import { callGateway, randomIdempotencyKey } from "../gateway/call.js";
+import { success } from "../globals.js";
+import type { RuntimeEnv } from "../runtime.js";
+
+export async function pollCommand(
+  opts: {
+    to: string;
+    question: string;
+    options: string[];
+    selectableCount?: number;
+    json?: boolean;
+    dryRun?: boolean;
+  },
+  _deps: CliDeps,
+  runtime: RuntimeEnv,
+) {
+  if (opts.options.length < 2) {
+    throw new Error("Poll requires at least 2 options");
+  }
+  if (opts.options.length > 12) {
+    throw new Error("Poll supports at most 12 options");
+  }
+
+  if (opts.dryRun) {
+    runtime.log(
+      `[dry-run] would send poll to ${opts.to}:\n  Question: ${opts.question}\n  Options: ${opts.options.join(", ")}\n  Selectable: ${opts.selectableCount ?? 1}`,
+    );
+    return;
+  }
+
+  const result = await callGateway<{
+    messageId: string;
+    toJid?: string;
+  }>({
+    url: "ws://127.0.0.1:18789",
+    method: "poll",
+    params: {
+      to: opts.to,
+      question: opts.question,
+      options: opts.options,
+      selectableCount: opts.selectableCount ?? 1,
+      idempotencyKey: randomIdempotencyKey(),
+    },
+    timeoutMs: 10_000,
+    clientName: "cli",
+    mode: "cli",
+  });
+
+  runtime.log(
+    success(
+      `✅ Poll sent via gateway. Message ID: ${result.messageId ?? "unknown"}`,
+    ),
+  );
+  if (opts.json) {
+    runtime.log(
+      JSON.stringify(
+        {
+          provider: "whatsapp",
+          via: "gateway",
+          to: opts.to,
+          toJid: result.toJid,
+          messageId: result.messageId,
+          question: opts.question,
+          options: opts.options,
+          selectableCount: opts.selectableCount ?? 1,
+        },
+        null,
+        2,
+      ),
+    );
+  }
+}