feat: add chunking mode for outbound messages

- Introduced `chunkMode` option in various account configurations to allow splitting messages by "length" or "newline".
- Updated message processing to handle chunking based on the selected mode.
- Added tests for new chunking functionality, ensuring correct behavior for both modes.

extensions/matrix/src/config-schema.ts

@@ -50,6 +50,7 @@ export const MatrixConfigSchema = z.object({
   replyToMode: z.enum(["off", "first", "all"]).optional(),
   threadReplies: z.enum(["off", "inbound", "always"]).optional(),
   textChunkLimit: z.number().optional(),
+  chunkMode: z.enum(["length", "newline"]).optional(),
   mediaMaxMb: z.number().optional(),
   autoJoin: z.enum(["always", "allowlist", "off"]).optional(),
   autoJoinAllowlist: z.array(allowFromEntry).optional(),

extensions/matrix/src/types.ts

@@ -69,6 +69,8 @@ export type MatrixConfig = {
   threadReplies?: "off" | "inbound" | "always";
   /** Outbound text chunk size (chars). Default: 4000. */
   textChunkLimit?: number;
+  /** Chunking mode: "length" (default) splits by size, "newline" splits on every newline. */
+  chunkMode?: "length" | "newline";
   /** Max outbound media size in MB. */
   mediaMaxMb?: number;
   /** Auto-join invites (always|allowlist|off). Default: always. */