[refactor](workspace): complete remaining architecture phases

Bundle all pending repository updates, including plugin context de-globalization, runtime hardening, config validation, boundary tests, and supporting docs/scripts.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>

src/trx-client/trx-frontend/trx-frontend-rigctl/src/lib.rs

@@ -8,8 +8,3 @@ pub fn register_frontend_on(context: &mut trx_frontend::FrontendRegistrationCont
     use trx_frontend::FrontendSpawner;
     context.register_frontend("rigctl", server::RigctlFrontend::spawn_frontend);
 }
-
-pub fn register_frontend() {
-    use trx_frontend::FrontendSpawner;
-    trx_frontend::register_frontend("rigctl", server::RigctlFrontend::spawn_frontend);
-}