docs: document discord ignoreOtherMentions

docs/channels/discord.md

@@ -419,6 +419,7 @@ Example:
       guilds: {
         "123456789012345678": {
           requireMention: true,
+          ignoreOtherMentions: true,
           users: ["987654321098765432"],
           roles: ["123456789012345678"],
           channels: {
@@ -446,6 +447,7 @@ Example:
     - implicit reply-to-bot behavior in supported cases
 
     `requireMention` is configured per guild/channel (`channels.discord.guilds...`).
+    `ignoreOtherMentions` optionally drops messages that mention another user/role but not the bot (excluding @everyone/@here).
 
     Group DMs:
 

docs/gateway/configuration-reference.md

@@ -245,6 +245,7 @@ WhatsApp runs through the gateway's web channel (Baileys Web). It starts automat
         "123456789012345678": {
           slug: "friends-of-openclaw",
           requireMention: false,
+          ignoreOtherMentions: true,
           reactionNotifications: "own",
           users: ["987654321098765432"],
           channels: {
@@ -306,6 +307,7 @@ WhatsApp runs through the gateway's web channel (Baileys Web). It starts automat
 - Use `user:<id>` (DM) or `channel:<id>` (guild channel) for delivery targets; bare numeric IDs are rejected.
 - Guild slugs are lowercase with spaces replaced by `-`; channel keys use the slugged name (no `#`). Prefer guild IDs.
 - Bot-authored messages are ignored by default. `allowBots: true` enables them (own messages still filtered).
+- `channels.discord.guilds.<id>.ignoreOtherMentions` (and channel overrides) drops messages that mention another user or role but not the bot (excluding @everyone/@here).
 - `maxLinesPerMessage` (default 17) splits tall messages even when under 2000 chars.
 - `channels.discord.threadBindings` controls Discord thread-bound routing:
   - `enabled`: Discord override for thread-bound session features (`/focus`, `/unfocus`, `/agents`, `/session idle`, `/session max-age`, and bound delivery/routing)