CLI: reduce channels add startup memory (#46784)

* CLI: lazy-load channel subcommand handlers

* Channels: defer add command dependencies

* CLI: skip status JSON plugin preload

* CLI: cover status JSON route preload

* Status: trim JSON security audit path

* Status: update JSON fast-path tests

* CLI: cover root help fast path

* CLI: fast-path root help

* Status: keep JSON security parity

* Status: restore JSON security tests

* CLI: document status plugin preload

* Channels: reuse Telegram account import

src/cli/program/command-registry.ts

@@ -235,6 +235,10 @@ function collectCoreCliCommandNames(predicate?: (command: CoreCliCommandDescript
   return names;
 }
 
+export function getCoreCliCommandDescriptors(): ReadonlyArray<CoreCliCommandDescriptor> {
+  return coreEntries.flatMap((entry) => entry.commands);
+}
+
 export function getCoreCliCommandNames(): string[] {
   return collectCoreCliCommandNames();
 }