plugin-sdk: add channel subpaths and migrate bundled plugins

scripts/write-plugin-sdk-entry-dts.ts

@@ -6,7 +6,18 @@ import path from "node:path";
 //
 // Our package export map points subpath `types` at `dist/plugin-sdk/<entry>.d.ts`, so we
 // generate stable entry d.ts files that re-export the real declarations.
-const entrypoints = ["index", "core", "telegram", "account-id"] as const;
+const entrypoints = [
+  "index",
+  "core",
+  "telegram",
+  "discord",
+  "slack",
+  "signal",
+  "imessage",
+  "whatsapp",
+  "line",
+  "account-id",
+] as const;
 for (const entry of entrypoints) {
   const out = path.join(process.cwd(), `dist/plugin-sdk/${entry}.d.ts`);
   fs.mkdirSync(path.dirname(out), { recursive: true });