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/implementing-patch-management-for-ot-systems/SKILL.md

@@ -1,11 +1,11 @@
 ---
 name: implementing-patch-management-for-ot-systems
-description: 'This skill covers implementing a structured patch management program
-  for OT/ICS environments where traditional IT patching approaches can cause process
-  disruption or safety hazards. It addresses vendor compatibility testing, risk-based
-  patch prioritization, staged deployment through test environments, maintenance window
-  coordination, rollback procedures, and compensating controls when patches cannot
-  be applied due to operational constraints or vendor restrictions.
+description: 'Implements a structured patch management program for OT/ICS environments
+  where IT-style patching can cause process disruption or safety hazards, covering
+  vendor compatibility testing, risk-based prioritization, staged test deployment,
+  maintenance window coordination, rollback procedures, and compensating controls.
+  Use when planning or auditing patching for SCADA, PLCs, or other industrial control
+  systems.
 
   '
 domain: cybersecurity