fix: add per-channel markdown table conversion (#1495) (thanks @odysseus0)

src/config/types.imessage.ts

@@ -1,4 +1,9 @@
-import type { BlockStreamingCoalesceConfig, DmPolicy, GroupPolicy } from "./types.base.js";
+import type {
+  BlockStreamingCoalesceConfig,
+  DmPolicy,
+  GroupPolicy,
+  MarkdownConfig,
+} from "./types.base.js";
 import type { DmConfig } from "./types.messages.js";
 
 export type IMessageAccountConfig = {
@@ -6,6 +11,8 @@ export type IMessageAccountConfig = {
   name?: string;
   /** Optional provider capability tags used for agent/runtime guidance. */
   capabilities?: string[];
+  /** Markdown formatting overrides (tables). */
+  markdown?: MarkdownConfig;
   /** Allow channel-initiated config writes (default: true). */
   configWrites?: boolean;
   /** If false, do not start this iMessage account. Default: true. */