feat: xserial-client with session management, mlua integration, and 238 tests

- Session: background I/O task with SessionHandle for send/read/close/reconfigure
- SessionManager: multi-session collection with aggregated event broadcast
- Config: serializable SessionConfig/PipelineConfig/FramerConfig/DecoderConfig
- Lua: xserial global (open/list_ports/sleep/log) + session userdata API
- RingBuffer: bounded history buffer with pipeline filtering
- Core: added Serialize/Deserialize+Default to Endian/TextEncoding/PlotFormat
- Core: added Send bound to Framer trait for tokio task compatibility
- 238 tests (193 core + 10 config + 7 Lua + 9 session + 18 pipeline + 1 doctest)

crates/xserial-client/Cargo.toml

@@ -5,5 +5,13 @@ edition = "2024"
 
 [dependencies]
 xserial-core = { path = "../xserial-core" }
-tokio = { workspace = true }
+tokio = { workspace = true, features = ["sync", "time"] }
 tracing = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+mlua = { workspace = true }
+thiserror = { workspace = true }
+
+[dev-dependencies]
+tokio = { workspace = true, features = ["full"] }
+tracing-subscriber = { workspace = true }