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-cloud-penetration-testing-with-pacu/SKILL.md

@@ -1,9 +1,10 @@
 ---
 name: performing-cloud-penetration-testing-with-pacu
-description: 'Performing authorized AWS penetration testing using Pacu, the open-source
-  AWS exploitation framework, to enumerate IAM configurations, discover privilege
-  escalation paths, test credential harvesting, and validate security controls through
-  systematic attack simulation.
+description: 'Run authorized AWS penetration tests with Pacu, the open-source AWS exploitation
+  framework, to enumerate IAM configuration, scan for privilege escalation paths, and
+  test data access and lateral movement using compromised credentials. Use when conducting
+  authorized red-team assessments of AWS environments, validating IAM policies and
+  SCPs, or determining the blast radius of compromised AWS credentials.
 
   '
 domain: cybersecurity