docs: Update documentation for 145 files

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docs/auriondocs/Code/src/EchoHub.Server.Irc/IrcMessage.cs.md

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+# IrcMessage
+
+> **File:** `src/EchoHub.Server.Irc/IrcMessage.cs`  
+> **Kind:** class
+
+```csharp
+public sealed class IrcMessage
+```
+
+
+IrcMessage is a parsed representation of an IRC protocol line that exposes the optional Prefix, the Command, and the Parameters that form the line's arguments; if a trailing payload is present, Trailing provides access to it. Use IrcMessage.Parse to convert a raw line into a structured object and inspect the command and its arguments without manual parsing.
+
+## Remarks
+IrcMessage encapsulates the parsing result and keeps IRC-logic separate from application code. Its properties are immutable (init-only), which makes parsed messages safe to share across components after parsing. Trailing is a derived convenience that reflects the trailing payload via the Parameters collection, aligning with the IRC grammar without introducing extra mutable state.
+
+## Notes
+- Trailing property returns the last parameter when any parameters exist; it's a convenience for the trailing payload and assumes a leading ':' in the raw line to populate it. If there was no trailing parameter in the line, Trailing will reflect the final parameter but may not be semantically a trailing payload.