chore(comments): drop the spec task codes the last pass missed

Codes like POP-1c or B4b-2 name a task in a planning document, not
anything in the code. A reader has no way to resolve them and they age
into noise the moment the document is closed. Where a code was used as a
reference, the sentence now names the function it meant.

HellionChat/Infrastructure/Hosting/InitHostedServices.cs

@@ -29,7 +29,7 @@ internal sealed class ThemeRegistryInitHostedService(
         foreach (var _ in registry.AllCustom()) { }
         registry.SwitchSilent(Plugin.Config.Theme);
 
-        // B4b-3: point font sizes at the active theme's typography, wire future
+        // Point font sizes at the active theme's typography, wire future
         // theme switches to the atlas rebuild, and apply the boot theme's override.
         fontManager.SetTypographySource(() => registry.Active.Typography);
         registry.SetActiveChangedCallback(() => fontManager.RebuildDelegateFontsIfChanged());