refactor: Update changelog for v0.2.2 to reflect startup and shutdown fixes, and standardize constructor injection

docs/changelog/index.md

@@ -4,7 +4,7 @@ Release history for EchoHub.
 
 ## Releases
 
-- [v0.2.2](v0.2.2.md) - Shutdown Fix
+- [v0.2.2](v0.2.2.md) - Startup & Shutdown Fixes
 - [v0.2.1](v0.2.1.md) - Shutdown & CI Fixes
 - [v0.2.0](v0.2.0.md) - IRC Gateway
 - [v0.1.1](v0.1.1.md) - Directory Connection Self-Healing

docs/changelog/v0.2.2.md

@@ -1,7 +1,14 @@
-# v0.2.2 - Shutdown Fix
+# v0.2.2 - Startup & Shutdown Fixes
 
 ## Fixes
 
-- Actually fixed server hanging on Ctrl+C — replaced `await using` with explicit dispose bounded to 3 seconds, so a stuck `HubConnection` can no longer block shutdown
+- Fixed server hanging on startup when IRC gateway is enabled — circular DI dependency between `IrcGatewayService` → `IChatService` → `IChatBroadcaster` → `IrcBroadcaster` caused the DI container to deadlock
+- Fixed `SignalRBroadcaster` eagerly resolving `IHubContext<ChatHub>` during DI construction, which could deadlock on some platforms — now lazy-resolves via `IServiceProvider` on first use
+- Simplified IRC service registration to use standard `AddSingleton<IChatBroadcaster, IrcBroadcaster>` instead of manual factory, breaking the circular resolution chain
+- Fixed server hanging on Ctrl+C — replaced `await using` with explicit dispose bounded to 3 seconds, so a stuck `HubConnection` can no longer block shutdown
 - Reduced host shutdown timeout from 30s (default) to 5s
 - Caught `OperationCanceledException` in the directory service reconnect loop so cancellation exits immediately instead of propagating through dispose
+
+## Refactoring
+
+- Replaced primary constructors with standard constructor injection across all server classes for consistency