[refactor](trx-protocol): move transport dto out of core

Phase 5: relocate ClientCommand/Envelope/Response into trx-protocol and update call sites so trx-core remains domain-focused.

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

src/trx-client/trx-frontend/trx-frontend-http/Cargo.toml

@@ -10,6 +10,7 @@ edition = "2021"
 [dependencies]
 trx-core = { path = "../../../trx-core" }
 trx-frontend = { path = ".." }
+trx-protocol = { path = "../../../../src/trx-protocol" }
 tokio = { workspace = true, features = ["full"] }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }

src/trx-client/trx-frontend/trx-frontend-rigctl/Cargo.toml

@@ -12,3 +12,4 @@ tokio = { workspace = true, features = ["full"] }
 tracing = { workspace = true }
 trx-core = { path = "../../../trx-core" }
 trx-frontend = { path = ".." }
+trx-protocol = { path = "../../../../src/trx-protocol" }

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

@@ -11,6 +11,7 @@ use tokio::sync::{mpsc, oneshot, watch};
 use tokio::task::JoinHandle;
 use tokio::time::timeout;
 use tracing::{debug, error, info, warn};
+use trx_protocol::{mode_to_string, parse_mode};
 
 use trx_core::radio::freq::Freq;
 use trx_core::rig::state::RigSnapshot;
@@ -252,26 +253,8 @@ fn current_snapshot(state_rx: &watch::Receiver<RigState>) -> Option<RigSnapshot>
     state_rx.borrow().snapshot()
 }
 
-fn parse_mode(s: &str) -> RigMode {
-    match s.to_ascii_uppercase().as_str() {
-        "LSB" => RigMode::LSB,
-        "USB" => RigMode::USB,
-        "CW" => RigMode::CW,
-        "CWR" => RigMode::CWR,
-        "AM" => RigMode::AM,
-        "FM" => RigMode::FM,
-        "WFM" => RigMode::WFM,
-        "DIG" | "DIGI" => RigMode::DIG,
-        "PKT" | "PACKET" => RigMode::PKT,
-        other => RigMode::Other(other.to_string()),
-    }
-}
-
 fn rig_mode_to_str(mode: &RigMode) -> String {
-    match mode {
-        RigMode::Other(other) => other.clone(),
-        other => format!("{:?}", other),
-    }
+    mode_to_string(mode)
 }
 
 fn dump_state_lines(_snapshot: &RigSnapshot) -> Vec<String> {