refactor(reply): clarify explicit reply tags in off mode (#16189)

* refactor(reply): clarify explicit reply tags in off mode

* fix(plugin-sdk): alias account-id subpath for extensions

src/channels/dock.ts

@@ -369,7 +369,7 @@ const DOCKS: Record<ChatChannelId, ChannelDock> = {
     threading: {
       resolveReplyToMode: ({ cfg, accountId, chatType }) =>
         resolveSlackReplyToMode(resolveSlackAccount({ cfg, accountId }), chatType),
-      allowTagsWhenOff: true,
+      allowExplicitReplyTagsWhenOff: true,
       buildToolContext: (params) => buildSlackThreadingToolContext(params),
     },
   },

src/channels/plugins/types.core.ts

@@ -223,6 +223,16 @@ export type ChannelThreadingAdapter = {
     accountId?: string | null;
     chatType?: string | null;
   }) => "off" | "first" | "all";
+  /**
+   * When replyToMode is "off", allow explicit reply tags/directives to keep replyToId.
+   *
+   * Default in shared reply flow: true for known providers; per-channel opt-out supported.
+   */
+  allowExplicitReplyTagsWhenOff?: boolean;
+  /**
+   * Deprecated alias for allowExplicitReplyTagsWhenOff.
+   * Kept for compatibility with older extensions/docks.
+   */
   allowTagsWhenOff?: boolean;
   buildToolContext?: (params: {
     cfg: OpenClawConfig;