feat: integrate meshservice crate into workspace

- Add meshservice to workspace members
- Fix quicprochat-client: add MeshTrace/MeshStats slash commands
- Add integration test: meshservice_tcp_transport
- Document integration points in README and docs/status.md
- Verify shared identity (IdentityKeypair → MeshAddress)

crates/quicprochat-client/src/client/command_engine.rs

@@ -119,6 +119,8 @@ pub enum Command {
     MeshRoute,
     MeshIdentity,
     MeshStore,
+    MeshTrace { address: String },
+    MeshStats,
 
     // Security / crypto
     Verify { username: String },
@@ -187,6 +189,8 @@ impl Command {
             Command::MeshRoute => Some(SlashCommand::MeshRoute),
             Command::MeshIdentity => Some(SlashCommand::MeshIdentity),
             Command::MeshStore => Some(SlashCommand::MeshStore),
+            Command::MeshTrace { address } => Some(SlashCommand::MeshTrace { address }),
+            Command::MeshStats => Some(SlashCommand::MeshStats),
             Command::Verify { username } => Some(SlashCommand::Verify { username }),
             Command::UpdateKey => Some(SlashCommand::UpdateKey),
             Command::Typing => Some(SlashCommand::Typing),
@@ -348,6 +352,8 @@ fn slash_to_command(sc: SlashCommand) -> Command {
         SlashCommand::MeshRoute => Command::MeshRoute,
         SlashCommand::MeshIdentity => Command::MeshIdentity,
         SlashCommand::MeshStore => Command::MeshStore,
+        SlashCommand::MeshTrace { address } => Command::MeshTrace { address },
+        SlashCommand::MeshStats => Command::MeshStats,
         SlashCommand::Verify { username } => Command::Verify { username },
         SlashCommand::UpdateKey => Command::UpdateKey,
         SlashCommand::Typing => Command::Typing,
@@ -415,6 +421,8 @@ async fn execute_slash(
         SlashCommand::MeshRoute => cmd_mesh_route(session),
         SlashCommand::MeshIdentity => cmd_mesh_identity(session),
         SlashCommand::MeshStore => cmd_mesh_store(session),
+        SlashCommand::MeshTrace { address } => cmd_mesh_trace(session, &address),
+        SlashCommand::MeshStats => cmd_mesh_stats(session),
         SlashCommand::Verify { username } => cmd_verify(session, client, &username).await,
         SlashCommand::UpdateKey => cmd_update_key(session, client).await,
         SlashCommand::Typing => cmd_typing(session, client).await,

crates/quicprochat-client/src/client/playbook.rs

@@ -434,6 +434,10 @@ impl PlaybookRunner {
             "mesh-route" => Ok(Command::MeshRoute),
             "mesh-identity" | "mesh-id" => Ok(Command::MeshIdentity),
             "mesh-store" => Ok(Command::MeshStore),
+            "mesh-trace" => Ok(Command::MeshTrace {
+                address: self.resolve_str(&step.args, "address")?,
+            }),
+            "mesh-stats" => Ok(Command::MeshStats),
 
             other => bail!("unknown command: {other}"),
         }