feat(trogon-acp-runner): add RpcServer and standalone binary

- Add RpcServer: handles all non-prompt ACP methods (initialize,
  authenticate, new_session, load_session, set_session_mode,
  set_session_config_option, list_sessions, fork_session, resume_session)
  via NATS request-reply, so acp-nats-ws can be a pure dumb pipe
- Add main.rs binary that runs RpcServer + Runner together, pairing
  with acp-nats-ws for the WebSocket deployment path
- Fix coverage build: add #![cfg_attr(coverage, allow(dead_code,
  unused_imports))] to acp-nats-stdio/src/main.rs and
  acp-nats-ws/src/main.rs to silence dead_code errors under --cfg=coverage
- Move terminal_output_cap from Bridge to TrogonAcpAgent (Cell<bool>)
  following the dumb-pipe Bridge refactor

Author: jramirezhdez02

rsworkspace/Cargo.lock

@@ -1,3 +1,4 @@
+#![cfg_attr(coverage, allow(dead_code, unused_imports))]
 mod config;
 
 use acp_nats::{StdJsonSerialize, agent::Bridge, client, spawn_notification_forwarder};

rsworkspace/crates/acp-nats-stdio/src/main.rs

@@ -1,3 +1,4 @@
+#![cfg_attr(coverage, allow(dead_code, unused_imports))]
 mod config;
 mod connection;
 mod upgrade;

rsworkspace/crates/acp-nats-ws/src/main.rs

@@ -8,6 +8,8 @@ workspace = true
 
 [dependencies]
 acp-nats      = { path = "../acp-nats" }
+agent-client-protocol = { version = "0.9.4", features = ["unstable_session_fork", "unstable_session_resume", "unstable_session_list"] }
+uuid          = { version = "1", features = ["v4"] }
 anyhow        = "1"
 async-nats    = "0.45.0"
 bytes         = "1"
@@ -16,7 +18,8 @@ reqwest       = { version = "0.12", default-features = false, features = ["rustl
 serde         = { version = "1.0.228", features = ["derive"] }
 serde_json    = "1.0.149"
 tokio         = { version = "1.49.0", features = ["full"] }
-tracing       = "0.1.44"
+tracing            = "0.1.44"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 
 trogon-agent-core = { path = "../trogon-agent-core" }
 trogon-mcp        = { path = "../trogon-mcp" }

rsworkspace/crates/trogon-acp-runner/Cargo.toml

@@ -1,9 +1,11 @@
 #![cfg_attr(coverage, feature(coverage_attribute))]
 
 pub mod permission;
+pub mod rpc_server;
 pub mod runner;
 pub mod session_store;
 
 pub use permission::{ChannelPermissionChecker, PermissionReq, PermissionTx};
+pub use rpc_server::RpcServer;
 pub use runner::{GatewayConfig, Runner};
 pub use session_store::{SessionState, SessionStore, StoredMcpServer};