fix(cli): initialize plugins before pairing CLI registration (#3272)

The pairing CLI calls listPairingChannels() at registration time,
which requires the plugin registry to be populated. Without this,
plugin-provided channels like Matrix fail with "does not support
pairing" even though they have pairing adapters defined.

This mirrors the existing pattern used by the plugins CLI entry.

Co-authored-by: Shakker <165377636+shakkernerd@users.noreply.github.com>

src/cli/program/register.subclis.ts

@@ -168,6 +168,11 @@ const entries: SubCliEntry[] = [
     name: "pairing",
     description: "Pairing helpers",
     register: async (program) => {
+      // Initialize plugins before registering pairing CLI.
+      // The pairing CLI calls listPairingChannels() at registration time,
+      // which requires the plugin registry to be populated with channel plugins.
+      const { registerPluginCliCommands } = await import("../../plugins/cli.js");
+      registerPluginCliCommands(program, await loadConfig());
       const mod = await import("../pairing-cli.js");
       mod.registerPairingCli(program);
     },