refactor: rename cortex-neuron binary and crate to neuron

Package name, lib name, and binary all now just "neuron" without
the cortex- prefix.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -404,25 +404,6 @@ dependencies = [
  "urlencoding",
 ]
 
-[[package]]
-name = "cortex-neuron"
-version = "0.1.0"
-dependencies = [
- "anyhow",
- "async-trait",
- "axum",
- "clap",
- "cortex-core",
- "figment",
- "reqwest",
- "serde",
- "serde_json",
- "tokio",
- "toml",
- "tracing",
- "tracing-subscriber",
-]
-
 [[package]]
 name = "crossbeam-epoch"
 version = "0.9.18"
@@ -1201,6 +1182,25 @@ dependencies = [
  "tempfile",
 ]
 
+[[package]]
+name = "neuron"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "async-trait",
+ "axum",
+ "clap",
+ "cortex-core",
+ "figment",
+ "reqwest",
+ "serde",
+ "serde_json",
+ "tokio",
+ "toml",
+ "tracing",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "nom"
 version = "7.1.3"