feat(remote): deliver allowlisted Host events through ctx.remote.$on

api/remotes owns the allowlist and its type projection; type-meta owns the shape
predicate, the selection seat, and the internal remote/host-event carrier
signal; api/gateway's Client half turns that signal into $on callbacks through a
private dispatch. apiproxy forwards each allowlisted emission verbatim in one
host/remote-event frame, registered ahead of the derived invalidation frames so
frame order is unchanged, and drops the three per-event variants it replaces.
Owner packages move their Events declarations into client-safe ./types exports,
so a consumer's listener signature is the Host's own declaration.

packages/interaction/commands/src/index.ts

@@ -123,16 +123,6 @@ declare module '@deepseek-ai/cordis' {
   interface Context {
     commands: CommandService
   }
-
-  interface Events {
-    /**
-     * A command was registered or unregistered. This is an unfiltered registry
-     * notification because a global or scoped change may affect any UI view.
-     * Observer failures are contained and cannot veto the registry mutation.
-     * @mode emit
-     */
-    'commands/change'(): void
-  }
 }
 
 /**