feat(discord): add silent message support (SUPPRESS_NOTIFICATIONS flag)

- Add silent option to message tool for Discord
- Passes SUPPRESS_NOTIFICATIONS flag (4096) to Discord API
- Threads silent param through entire outbound chain:
  - message-action-runner.ts
  - outbound-send-service.ts
  - message.ts
  - deliver.ts
  - discord outbound adapter
  - send.outbound.ts
  - send.shared.ts

Usage: message tool with silent=true suppresses push/desktop notifications

src/infra/outbound/deliver.ts

@@ -86,6 +86,7 @@ async function createChannelHandler(params: {
   threadId?: string | number | null;
   deps?: OutboundSendDeps;
   gifPlayback?: boolean;
+  silent?: boolean;
 }): Promise<ChannelHandler> {
   const outbound = await loadChannelOutboundAdapter(params.channel);
   if (!outbound?.sendText || !outbound?.sendMedia) {
@@ -101,6 +102,7 @@ async function createChannelHandler(params: {
     threadId: params.threadId,
     deps: params.deps,
     gifPlayback: params.gifPlayback,
+    silent: params.silent,
   });
   if (!handler) {
     throw new Error(`Outbound not configured for channel: ${params.channel}`);
@@ -118,6 +120,7 @@ function createPluginHandler(params: {
   threadId?: string | number | null;
   deps?: OutboundSendDeps;
   gifPlayback?: boolean;
+  silent?: boolean;
 }): ChannelHandler | null {
   const outbound = params.outbound;
   if (!outbound?.sendText || !outbound?.sendMedia) {
@@ -143,6 +146,7 @@ function createPluginHandler(params: {
             threadId: params.threadId,
             gifPlayback: params.gifPlayback,
             deps: params.deps,
+            silent: params.silent,
             payload,
           })
       : undefined,
@@ -156,6 +160,7 @@ function createPluginHandler(params: {
         threadId: params.threadId,
         gifPlayback: params.gifPlayback,
         deps: params.deps,
+        silent: params.silent,
       }),
     sendMedia: async (caption, mediaUrl) =>
       sendMedia({
@@ -168,6 +173,7 @@ function createPluginHandler(params: {
         threadId: params.threadId,
         gifPlayback: params.gifPlayback,
         deps: params.deps,
+        silent: params.silent,
       }),
   };
 }
@@ -192,6 +198,7 @@ export async function deliverOutboundPayloads(params: {
     text?: string;
     mediaUrls?: string[];
   };
+  silent?: boolean;
 }): Promise<OutboundDeliveryResult[]> {
   const { cfg, channel, to, payloads } = params;
   const accountId = params.accountId;
@@ -208,6 +215,7 @@ export async function deliverOutboundPayloads(params: {
     replyToId: params.replyToId,
     threadId: params.threadId,
     gifPlayback: params.gifPlayback,
+    silent: params.silent,
   });
   const textLimit = handler.chunker
     ? resolveTextChunkLimit(cfg, channel, accountId, {

src/infra/outbound/message-action-runner.ts

@@ -820,6 +820,7 @@ async function handleSendAction(ctx: ResolvedActionContext): Promise<MessageActi
   params.message = message;
   const gifPlayback = readBooleanParam(params, "gifPlayback") ?? false;
   const bestEffort = readBooleanParam(params, "bestEffort");
+  const silent = readBooleanParam(params, "silent");
 
   const replyToId = readStringParam(params, "replyTo");
   const threadId = readStringParam(params, "threadId");
@@ -884,6 +885,7 @@ async function handleSendAction(ctx: ResolvedActionContext): Promise<MessageActi
             }
           : undefined,
       abortSignal,
+      silent: silent ?? undefined,
     },
     to,
     message,

src/infra/outbound/message.ts

@@ -51,6 +51,7 @@ type MessageSendParams = {
     mediaUrls?: string[];
   };
   abortSignal?: AbortSignal;
+  silent?: boolean;
 };
 
 export type MessageSendResult = {
@@ -173,6 +174,7 @@ export async function sendMessage(params: MessageSendParams): Promise<MessageSen
       deps: params.deps,
       bestEffort: params.bestEffort,
       abortSignal: params.abortSignal,
+      silent: params.silent,
       mirror: params.mirror
         ? {
             ...params.mirror,

src/infra/outbound/outbound-send-service.ts

@@ -34,6 +34,7 @@ export type OutboundSendContext = {
     mediaUrls?: string[];
   };
   abortSignal?: AbortSignal;
+  silent?: boolean;
 };
 
 function extractToolPayload(result: AgentToolResult<unknown>): unknown {
@@ -128,6 +129,7 @@ export async function executeSendAction(params: {
     gateway: params.ctx.gateway,
     mirror: params.ctx.mirror,
     abortSignal: params.ctx.abortSignal,
+    silent: params.ctx.silent,
   });
 
   return {