fix(custom): move README out of src/ to fix tsup build

Author: K3P1EL

src/custom/README.md CUSTOM_MODULES.mdsrc/custom/README.md renamed to CUSTOM_MODULES.md

@@ -1 +1,8 @@
 // Custom button handler - our product differentiator
+// TODO: implement custom button logic here (stable send, custom syntax #btn|...)
+
+export const BUTTONS_HANDLER_VERSION = '0.0.1';
+
+export function ping(): string {
+  return 'pong';
+}

src/custom/buttons-handler.ts

@@ -1 +1,8 @@
-// Matrix perfecta integration
+// Matrix perfecta integration bridge
+// TODO: implement integration with Cloudflare Worker for burst grouping
+
+export const MATRIX_PERFECTA_VERSION = '0.0.1';
+
+export function ping(): string {
+  return 'pong';
+}