[chore](root): add trx-protocol to workspace

Update workspace Cargo.toml to include new trx-protocol crate
and update Cargo.lock with new dependencies.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>

Cargo.lock

@@ -2222,6 +2222,7 @@ dependencies = [
  "trx-frontend-http",
  "trx-frontend-http-json",
  "trx-frontend-rigctl",
+ "trx-protocol",
 ]
 
 [[package]]
@@ -2268,6 +2269,7 @@ dependencies = [
  "tracing",
  "trx-core",
  "trx-frontend",
+ "trx-protocol",
 ]
 
 [[package]]
@@ -2288,6 +2290,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "trx-protocol"
+version = "0.1.0"
+dependencies = [
+ "serde",
+ "serde_json",
+ "trx-core",
+]
+
 [[package]]
 name = "trx-server"
 version = "0.1.0"
@@ -2308,6 +2319,7 @@ dependencies = [
  "trx-backend",
  "trx-core",
  "trx-ft8",
+ "trx-protocol",
 ]
 
 [[package]]