Fix crash when dispose() arrives before connection initialization (#91)

Closes a race where calling dispose() on a connection actor before
internal initialization completed could crash with an unreachable
state error.

Author: SeanTAllen

.release-notes/fix-crash-dispose-before-initialization.md

@@ -0,0 +1,3 @@
+## Fix crash when dispose() arrives before connection initialization
+
+Fixed a crash that could occur when `dispose()` was called on a connection actor before its internal initialization completed. The race between initialization and disposal is unlikely but was observed on macOS arm64 CI.

CLAUDE.md

@@ -16,7 +16,7 @@ The `ssl` option is required because this library and lori depend on the `ssl` p
 
 Package: `stallion` (repo name is `stallion`, Pony package name is `stallion`)
 
-Built on lori (v0.12.0). Lori provides raw TCP I/O with a connection-actor model: `_on_received(data: Array[U8] iso)` for incoming data, `TCPConnection.send(data): (SendToken | SendError)` for outgoing, plus backpressure notifications, SSL support, per-connection ASIO-level idle timers, and general-purpose one-shot timers.
+Built on lori (v0.13.0). Lori provides raw TCP I/O with a connection-actor model: `_on_received(data: Array[U8] iso)` for incoming data, `TCPConnection.send(data): (SendToken | SendError)` for outgoing, plus backpressure notifications, SSL support, per-connection ASIO-level idle timers, and general-purpose one-shot timers.
 
 ### Key design decisions
 

corral.json

@@ -13,7 +13,7 @@
   "deps": [
     {
       "locator": "github.com/ponylang/lori.git",
-      "version": "0.12.0"
+      "version": "0.13.0"
     },
     {
       "locator": "github.com/ponylang/ssl.git",