feat: wire channel mode runtime config and docs

plugin/rules.ts

@@ -12,6 +12,12 @@ export type DirigentConfig = {
   schedulingIdentifier?: string;
   /** Wait identifier: agent ends with this when waiting for a human reply (default: 👤) */
   waitIdentifier?: string;
+  /** Human-visible marker that enters multi-message mode for a channel (default: ↗️) */
+  multiMessageStartMarker?: string;
+  /** Human-visible marker that exits multi-message mode for a channel (default: ↙️) */
+  multiMessageEndMarker?: string;
+  /** Moderator marker sent after each human message while multi-message mode is active (default: ⤵️) */
+  multiMessagePromptMarker?: string;
   noReplyProvider: string;
   noReplyModel: string;
   noReplyPort?: number;
@@ -19,6 +25,14 @@ export type DirigentConfig = {
   moderatorBotToken?: string;
 };
 
+export type ChannelRuntimeMode = "normal" | "multi-message";
+
+export type ChannelRuntimeState = {
+  mode: ChannelRuntimeMode;
+  shuffling: boolean;
+  lastShuffledAt?: number;
+};
+
 export type ChannelPolicy = {
   listMode?: "human-list" | "agent-list";
   humanList?: string[];