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/gateway/protocol/schema.ts

@@ -198,6 +198,17 @@ export const SendParamsSchema = Type.Object(
   { additionalProperties: false },
 );
 
+export const PollParamsSchema = Type.Object(
+  {
+    to: NonEmptyString,
+    question: NonEmptyString,
+    options: Type.Array(NonEmptyString, { minItems: 2, maxItems: 12 }),
+    selectableCount: Type.Optional(Type.Integer({ minimum: 1, maximum: 12 })),
+    idempotencyKey: NonEmptyString,
+  },
+  { additionalProperties: false },
+);
+
 export const AgentParamsSchema = Type.Object(
   {
     message: NonEmptyString,
@@ -831,6 +842,7 @@ export const ProtocolSchemas: Record<string, TSchema> = {
   ErrorShape: ErrorShapeSchema,
   AgentEvent: AgentEventSchema,
   SendParams: SendParamsSchema,
+  PollParams: PollParamsSchema,
   AgentParams: AgentParamsSchema,
   AgentWaitParams: AgentWaitParamsSchema,
   WakeParams: WakeParamsSchema,
@@ -900,6 +912,7 @@ export type PresenceEntry = Static<typeof PresenceEntrySchema>;
 export type ErrorShape = Static<typeof ErrorShapeSchema>;
 export type StateVersion = Static<typeof StateVersionSchema>;
 export type AgentEvent = Static<typeof AgentEventSchema>;
+export type PollParams = Static<typeof PollParamsSchema>;
 export type AgentWaitParams = Static<typeof AgentWaitParamsSchema>;
 export type WakeParams = Static<typeof WakeParamsSchema>;
 export type NodePairRequestParams = Static<typeof NodePairRequestParamsSchema>;