chore: move default ports out of common-collision ranges

Previous defaults collided with well-trodden infra services and with
the Linux ephemeral port range:

- cortex API     8000 — common dev-server default (Django, minio UI)
- cortex metrics 9100 — Prometheus node_exporter default
- neuron API     9090 — Cockpit default on Fedora, Prometheus self

Move to helexa-themed palindromic ports, all below Linux's
32768-60999 ephemeral range and not registered to any well-known
service:

- cortex API     31313
- cortex metrics 31314
- neuron API     13131

Updated places:
- cortex.example.toml, neuron.example.toml defaults
- default impls in cortex-core and neuron config
- cortex-cli --endpoint default for the status subcommand
- doc comments citing example URLs
- README.md and CLAUDE.md snippets

Consumers already on the old ports need a one-line edit in their
/etc/cortex/cortex.toml or /etc/neuron/neuron.toml to match;
firewall rules and prometheus scrape configs will also need
updating.

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

CLAUDE.md

@@ -125,7 +125,8 @@ automatically. Clippy warnings must be resolved, not suppressed with
   - One or more GPU nodes running mistral.rs on port 8080
   - Optionally a metrics-only node (no GPU) for Prometheus/Grafana
 - Each node runs `mistralrs serve` on port 8080
-- Gateway listens on port 8000 (API) and 9100 (metrics)
+- Gateway listens on port 31313 (API) and 31314 (metrics)
+- neuron listens on port 13131 on each GPU host
 - TLS terminated at gateway or via nginx; internal traffic is plaintext over WireGuard
 
 ## Conventions
@@ -380,7 +381,7 @@ processes (one process per loaded model, each on its own port).
 
 ## neuron API
 
-neuron exposes an HTTP API on port 9090 that cortex polls and calls.
+neuron exposes an HTTP API on port 13131 that cortex polls and calls.
 
 ```
 GET  /discovery
@@ -424,8 +425,8 @@ endpoint. cortex.toml shrinks to:
 
 ```toml
 [gateway]
-listen = "0.0.0.0:8000"
-metrics_listen = "0.0.0.0:9100"
+listen = "0.0.0.0:31313"
+metrics_listen = "0.0.0.0:31314"
 
 [eviction]
 strategy = "lru"
@@ -433,15 +434,15 @@ defrag_after_cycles = 50
 
 [[neurons]]
 name = "beast"
-endpoint = "http://beast.hanzalova.internal:9090"
+endpoint = "http://beast.hanzalova.internal:13131"
 
 [[neurons]]
 name = "benjy"
-endpoint = "http://benjy.kosherinata.internal:9090"
+endpoint = "http://benjy.hanzalova.internal:13131"
 
 [[neurons]]
 name = "quadbrat"
-endpoint = "http://quadbrat.hanzalova.internal:9090"
+endpoint = "http://quadbrat.hanzalova.internal:13131"
 ```
 
 On startup and periodically, cortex calls `GET /discovery` and
@@ -521,7 +522,7 @@ cortex/
 │   │       └── metrics.rs      # prometheus exporter (unchanged)
 │   ├── neuron/                 # node plane (replaces cortex-agent)
 │   │   └── src/
-│   │       ├── main.rs         # binary entrypoint, axum server on :9090
+│   │       ├── main.rs         # binary entrypoint, axum server on :13131
 │   │       ├── discovery.rs    # nvidia-smi, device enumeration
 │   │       ├── health.rs       # runtime GPU polling
 │   │       ├── api.rs          # HTTP handlers for /discovery, /models, etc.

README.md

@@ -88,8 +88,8 @@ WantedBy=multi-user.target
 ```toml
 # cortex.toml
 [gateway]
-listen = "0.0.0.0:8000"
-metrics_listen = "0.0.0.0:9100"
+listen = "0.0.0.0:31313"
+metrics_listen = "0.0.0.0:31314"
 
 [eviction]
 strategy = "lru"        # lru | priority
@@ -143,7 +143,7 @@ cortex serve --config cortex.toml
 cortex status
 
 # list all models across nodes
-curl http://localhost:8000/v1/models
+curl http://localhost:31313/v1/models
 ```
 
 ## License

cortex.example.toml

@@ -3,11 +3,11 @@
 # Copy to cortex.toml and adjust for your environment.
 #
 # Environment variable overrides use CORTEX_ prefix with __ separators:
-#   CORTEX_GATEWAY__LISTEN=0.0.0.0:9000
+#   CORTEX_GATEWAY__LISTEN=0.0.0.0:31313
 
 [gateway]
-listen = "0.0.0.0:8000"
-metrics_listen = "0.0.0.0:9100"
+listen = "0.0.0.0:31313"
+metrics_listen = "0.0.0.0:31314"
 
 [eviction]
 strategy = "lru"

crates/cortex-cli/src/main.rs

@@ -23,7 +23,7 @@ enum Commands {
     /// Print the fleet status (models, nodes, health).
     Status {
         /// Gateway API endpoint to query.
-        #[arg(short, long, default_value = "http://localhost:8000")]
+        #[arg(short, long, default_value = "http://localhost:31313")]
         endpoint: String,
     },
 }

crates/cortex-core/src/config.rs

@@ -22,9 +22,9 @@ fn default_models_path() -> String {
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct GatewaySettings {
-    /// Address to listen on for API requests (e.g. "0.0.0.0:8000")
+    /// Address to listen on for API requests (e.g. "0.0.0.0:31313")
     pub listen: String,
-    /// Address to listen on for Prometheus metrics (e.g. "0.0.0.0:9100")
+    /// Address to listen on for Prometheus metrics (e.g. "0.0.0.0:31314")
     pub metrics_listen: String,
 }
 
@@ -50,7 +50,7 @@ pub enum EvictionStrategy {
 pub struct NeuronEndpoint {
     /// Human-readable node name (e.g. "beast")
     pub name: String,
-    /// Base URL of the neuron daemon (e.g. "http://beast.internal:9090")
+    /// Base URL of the neuron daemon (e.g. "http://beast.internal:13131")
     pub endpoint: String,
 }
 
@@ -70,8 +70,8 @@ impl Default for GatewayConfig {
     fn default() -> Self {
         Self {
             gateway: GatewaySettings {
-                listen: "0.0.0.0:8000".into(),
-                metrics_listen: "0.0.0.0:9100".into(),
+                listen: "0.0.0.0:31313".into(),
+                metrics_listen: "0.0.0.0:31314".into(),
             },
             eviction: EvictionSettings {
                 strategy: EvictionStrategy::Lru,

crates/cortex-core/src/node.rs

@@ -6,7 +6,7 @@ use std::collections::HashMap;
 #[derive(Debug, Clone)]
 pub struct NodeState {
     pub name: String,
-    /// Base URL of the neuron daemon (e.g. "http://beast.internal:9090").
+    /// Base URL of the neuron daemon (e.g. "http://beast.internal:13131").
     pub endpoint: String,
     pub healthy: bool,
     pub models: HashMap<String, ModelEntry>,

crates/neuron/src/config.rs

@@ -17,7 +17,7 @@ pub struct NeuronConfig {
 }
 
 fn default_port() -> u16 {
-    9090
+    13131
 }
 
 impl NeuronConfig {
@@ -33,7 +33,7 @@ impl NeuronConfig {
 impl Default for NeuronConfig {
     fn default() -> Self {
         Self {
-            port: 9090,
+            port: 13131,
             harnesses: vec![],
         }
     }

neuron.example.toml

@@ -3,9 +3,9 @@
 # Copy to /etc/neuron/neuron.toml and adjust for your environment.
 #
 # Environment variable overrides use NEURON_ prefix with __ separators:
-#   NEURON_PORT=9090
+#   NEURON_PORT=13131
 
-port = 9090
+port = 13131
 
 # -- Harnesses ---------------------------------------------------------------
 # Each [[harnesses]] entry declares an inference engine managed by neuron.