docs(di): trim cycle-internal codes and verbose block comments

Code comments were drifting into plan-internal shorthand (DI-2a,
Slice B, "see plan §9") that nobody outside the cycle authors can
decode. They also tended toward AI-generated paragraph blocks where a
two-line WHY would have done.

This commit tightens the comment surface from the v1.5.0 work:
- IPluginLogProxy header lists the consumer buckets without naming
  the cycle items that decided them.
- DalamudLogger / DalamudLoggingProvider provenance markers explain
  themselves in two lines each; the long EUPL-rationale paragraph
  moves to the commit message.
- PluginHostFactory block headers shrink to one line each, ASCII
  dividers come out, plan-internal codes go.
- Plugin.cs field doc and Phase-1 / DisposeAsync comments lose the
  cycle-name references; the file gains nothing from "C3 surfaced X"
  in code.
- FontManager / GameFunctions static-method notes shrink to one
  sentence each.
- InitHostedServices class header keeps the eager-resolve WHY in
  three lines, drops the constraint label.

Csharpier reformatted the .csproj layout (long PackageReference
multi-lined). No functional change, no behavior change.

HellionChat/Infrastructure/Logging/DalamudLoggingProvider.cs

@@ -10,9 +10,7 @@ namespace HellionChat.Infrastructure.Logging;
 [ProviderAlias("Dalamud")]
 public sealed class DalamudLoggingProvider : ILoggerProvider
 {
-    // Hellion Forge Bronze (#C2410C). Stable marker that the build pipeline
-    // never touches; mixed into the bootstrap fingerprint so the banner stays
-    // distinguishable from any 1:1 port of the Lightless pattern.
+    // Hellion Forge Bronze (#C2410C). Mixed into the bootstrap fingerprint.
     private const string HellionMarker = "HellionForgeBronzeC2410C";
 
     private readonly ConcurrentDictionary<string, DalamudLogger> _loggers = new(
@@ -27,12 +25,8 @@ public sealed class DalamudLoggingProvider : ILoggerProvider
         EmitBootstrapBanner();
     }
 
-    // Runs once per plugin load (the provider is a container singleton). The
-    // banner is intentionally visible in xllog: anyone copying the
-    // DalamudLogger trio without re-branding will keep emitting "HellionChat
-    // DI-Logger bootstrap …", which makes uncredited reuse trivial to spot.
-    // EUPL-1.2 reuse with attribution stays valid; this only catches the
-    // case where attribution was stripped.
+    // One-shot per plugin load. Intentionally visible in xllog so uncredited
+    // ports of the DalamudLogger trio keep announcing their origin.
     private void EmitBootstrapBanner()
     {
         var version =