Rewrite 548 skill descriptions to the activation rubric

Each rewritten description now states both what the skill does (concrete
capability, named tools/artifacts) and an explicit when-to-use trigger,
improving agent discovery/activation. Grounded in each skill's own body;
changes confined to the `description` field only (bodies and all other
frontmatter untouched). Produced by a gated audit->rewrite->recheck loop
(548 -> 0 flagged) with a sampled anti-invention check (0 ungrounded).

Schema: 817/817 pass. Framework-ID gate: 0 defects.

skills/reverse-engineering-dotnet-malware-with-dnspy/SKILL.md

@@ -1,10 +1,10 @@
 ---
 name: reverse-engineering-dotnet-malware-with-dnspy
-description: 'Reverse engineers .NET malware using dnSpy decompiler and debugger to
-  analyze C#/VB.NET source code, identify obfuscation techniques, extract configurations,
-  and understand malicious functionality including stealers, RATs, and loaders. Activates
-  for requests involving .NET malware analysis, C# malware decompilation, managed
-  code reverse engineering, or .NET obfuscation analysis.
+description: 'Reverse engineers .NET malware samples using the dnSpy decompiler and
+  debugger to read C#/VB.NET source, deobfuscate code protected by tools like ConfuserEx
+  or SmartAssembly, and extract hardcoded C2 configurations, keys, and credentials.
+  Use when a sample is identified as a .NET assembly (e.g. AgentTesla, AsyncRAT, RedLine
+  Stealer, Quasar RAT) and needs decompilation, deobfuscation, or config extraction.
 
   '
 domain: cybersecurity