feat(spider-execution-manager): Add single-process supervisor pool for the task executor.

Cargo.toml

@@ -3,6 +3,7 @@ resolver = "3"
 members = [
   "components/spider-core",
   "components/spider-derive",
+  "components/spider-execution-manager",
   "components/spider-storage",
   "components/spider-task-executor",
   "components/spider-tdl",

components/spider-execution-manager/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "spider-execution-manager"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+name = "spider_execution_manager"
+path = "src/lib.rs"
+
+[dependencies]
+bincode = "1.3.3"
+bytes = "1.10"
+futures-util = {
+  version = "0.3.31",
+  default-features = false,
+  features = ["sink", "std"]
+}
+rmp-serde = "1.3.1"
+spider-core = { path = "../spider-core" }
+spider-task-executor = { path = "../spider-task-executor" }
+spider-tdl = { path = "../spider-tdl" }
+thiserror = "2.0.18"
+tokio = {
+  version = "1.50.0",
+  features = ["io-util", "macros", "process", "rt", "sync", "time"]
+}
+tokio-util = { version = "0.7", features = ["codec"] }
+tracing = { version = "0.1.41", default-features = false, features = ["std"] }

components/spider-execution-manager/src/lib.rs

@@ -0,0 +1,4 @@
+//! Execution manager — the per-node service that drives Spider task execution against a
+//! `spider-task-executor` subprocess.
+
+pub mod process_pool;