fix(discord): use cached author.id when DMChannel.recipientId is null

DMChannel.recipientId can be null when client.channels.fetch() returns
a DM channel with a cold cache. The inbound gate correctly uses
msg.author.id, but fetchAllowedChannel relied on recipientId, so
replies to allowlisted DMs intermittently failed with "channel not
allowlisted" after session restart.

Maintain a channelId→userId map populated during inbound handling and
fall back to it when recipientId is null.

Fixes anthropics/claude-code#40576
Fixes anthropics/claude-code#41647

🏠 Remote-Dev: homespace

.claude-plugin/marketplace.json

@@ -7,16 +7,6 @@
     "email": "support@anthropic.com"
   },
   "plugins": [
-    {
-      "name": "adlc",
-      "description": "Agentforce Agent Development Life Cycle — author, discover, scaffold, deploy, test, and optimize .agent files",
-      "category": "development",
-      "source": {
-        "source": "url",
-        "url": "https://github.com/SalesforceAIResearch/agentforce-adlc.git"
-      },
-      "homepage": "https://github.com/SalesforceAIResearch/agentforce-adlc"
-    },
     {
       "name": "adspirer-ads-agent",
       "description": "Cross-platform ad management for Google Ads, Meta Ads, TikTok Ads, and LinkedIn Ads. 91 tools for keyword research, campaign creation, performance analysis, and budget optimization.",
@@ -179,27 +169,6 @@
       "category": "database",
       "homepage": "https://github.com/AzureCosmosDB/cosmosdb-claude-code-plugin"
     },
-    {
-      "name": "azure-skills",
-      "description": "Microsoft Azure MCP integration for cloud resource management, deployments, and Azure services. Manage your Azure infrastructure, monitor applications, and deploy resources directly from Claude Code.",
-      "category": "deployment",
-      "source": {
-        "source": "url",
-        "url": "https://github.com/microsoft/azure-skills.git"
-      },
-      "homepage": "https://github.com/microsoft/azure-skills"
-    },
-    {
-      "name": "base44",
-      "description": "Build and deploy Base44 full-stack apps with CLI project management and JavaScript/TypeScript SDK development skills",
-      "category": "development",
-      "source": {
-        "source": "url",
-        "url": "https://github.com/base44/skills.git",
-        "sha": "c7039b37eca0e2916a565a7395040c00055bcf8b"
-      },
-      "homepage": "https://docs.base44.com"
-    },
     {
       "name": "box",
       "description": "Work with your Box content directly from Claude Code — search files, organize folders, collaborate with your team, and use Box AI to answer questions, summarize documents, and extract data without leaving your workflow.",

external_plugins/discord/server.ts

@@ -222,6 +222,8 @@ type GateResult =
 const recentSentIds = new Set<string>()
 const RECENT_SENT_CAP = 200
 
+const dmChannelUsers = new Map<string, string>()
+
 function noteSent(id: string): void {
   recentSentIds.add(id)
   if (recentSentIds.size > RECENT_SENT_CAP) {
@@ -404,7 +406,8 @@ async function fetchAllowedChannel(id: string) {
   const ch = await fetchTextChannel(id)
   const access = loadAccess()
   if (ch.type === ChannelType.DM) {
-    if (access.allowFrom.includes(ch.recipientId)) return ch
+    const userId = ch.recipientId ?? dmChannelUsers.get(id)
+    if (userId && access.allowFrom.includes(userId)) return ch
   } else {
     const key = ch.isThread() ? ch.parentId ?? ch.id : ch.id
     if (key in access.groups) return ch
@@ -823,6 +826,10 @@ async function handleInbound(msg: Message): Promise<void> {
 
   const chat_id = msg.channelId
 
+  if (msg.channel.type === ChannelType.DM) {
+    dmChannelUsers.set(chat_id, msg.author.id)
+  }
+
   // Permission-reply intercept: if this looks like "yes xxxxx" for a
   // pending permission request, emit the structured event instead of
   // relaying as chat. The sender is already gate()-approved at this point