feat: add slack replyToModeByChatType overrides

src/config/types.slack.ts

@@ -17,7 +17,7 @@ export type SlackDmConfig = {
   groupEnabled?: boolean;
   /** Optional allowlist for group DM channels (ids or slugs). */
   groupChannels?: Array<string | number>;
-  /** Control reply threading for DMs (off|first|all). Overrides top-level replyToMode for DMs. */
+  /** @deprecated Prefer channels.slack.replyToModeByChatType.direct. */
   replyToMode?: ReplyToMode;
 };
 
@@ -119,6 +119,11 @@ export type SlackAccountConfig = {
   reactionAllowlist?: Array<string | number>;
   /** Control reply threading when reply tags are present (off|first|all). */
   replyToMode?: ReplyToMode;
+  /**
+   * Optional per-chat-type reply threading overrides.
+   * Example: { direct: "all", group: "first", channel: "off" }.
+   */
+  replyToModeByChatType?: Partial<Record<"direct" | "group" | "channel", ReplyToMode>>;
   /** Thread session behavior. */
   thread?: SlackThreadConfig;
   actions?: SlackActionConfig;

src/config/zod-schema.providers-core.ts

@@ -248,6 +248,7 @@ export const SlackDmSchema = z
     allowFrom: z.array(z.union([z.string(), z.number()])).optional(),
     groupEnabled: z.boolean().optional(),
     groupChannels: z.array(z.union([z.string(), z.number()])).optional(),
+    replyToMode: ReplyToModeSchema.optional(),
   })
   .strict()
   .superRefine((value, ctx) => {
@@ -280,6 +281,14 @@ export const SlackThreadSchema = z
   })
   .strict();
 
+const SlackReplyToModeByChatTypeSchema = z
+  .object({
+    direct: ReplyToModeSchema.optional(),
+    group: ReplyToModeSchema.optional(),
+    channel: ReplyToModeSchema.optional(),
+  })
+  .strict();
+
 export const SlackAccountSchema = z
   .object({
     name: z.string().optional(),
@@ -307,6 +316,7 @@ export const SlackAccountSchema = z
     reactionNotifications: z.enum(["off", "own", "all", "allowlist"]).optional(),
     reactionAllowlist: z.array(z.union([z.string(), z.number()])).optional(),
     replyToMode: ReplyToModeSchema.optional(),
+    replyToModeByChatType: SlackReplyToModeByChatTypeSchema.optional(),
     thread: SlackThreadSchema.optional(),
     actions: z
       .object({