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/performing-ransomware-tabletop-exercise/SKILL.md

@@ -1,12 +1,10 @@
 ---
 name: performing-ransomware-tabletop-exercise
-description: 'Plans and facilitates tabletop exercises simulating ransomware incidents
-  to test organizational readiness, decision-making, and communication procedures.
-  Designs realistic scenarios based on current ransomware threat actors (LockBit,
-  ALPHV/BlackCat, Cl0p), injects covering double extortion, backup destruction, and
-  regulatory notification requirements. Evaluates participant responses against NIST
-  CSF and CISA guidelines. Activates for requests involving ransomware tabletop, incident
-  response exercise, or ransomware readiness drill.
+description: 'Plans and facilitates tabletop exercises simulating ransomware incidents,
+  using realistic scenarios based on threat actors like LockBit and ALPHV/BlackCat
+  with injects covering double extortion and backup destruction, then evaluates responses
+  against NIST CSF and CISA guidelines. Use when planning or running a ransomware
+  tabletop exercise or incident response readiness drill.
 
   '
 domain: cybersecurity