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-ransomware-backup-strategy/SKILL.md

@@ -1,12 +1,10 @@
 ---
 name: implementing-ransomware-backup-strategy
-description: 'Designs and implements a ransomware-resilient backup strategy following
-  the 3-2-1-1-0 methodology (3 copies, 2 media types, 1 offsite, 1 immutable/air-gapped,
-  0 errors on restore verification). Configures backup schedules aligned to RPO/RTO
-  requirements, implements backup credential isolation to prevent ransomware from
-  compromising backup infrastructure, and establishes automated restore testing. Activates
-  for requests involving ransomware backup planning, backup resilience, air-gapped
-  backup design, or backup recovery point objective configuration.
+description: 'Designs a ransomware-resilient backup strategy using the 3-2-1-1-0
+  methodology (3 copies, 2 media types, 1 offsite, 1 immutable/air-gapped, 0 restore
+  errors), configuring RPO/RTO-aligned schedules, isolating backup credentials, and
+  automating restore testing. Use when planning ransomware backup resilience or air-gapped/immutable
+  backup architecture.
 
   '
 domain: cybersecurity