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-kubernetes-pod-security-standards/SKILL.md

@@ -1,8 +1,12 @@
 ---
 name: implementing-kubernetes-pod-security-standards
-description: Pod Security Standards (PSS) define three levels of security policies
-  -- Privileged, Baseline, and Restricted -- enforced by the Pod Security Admission
-  (PSA) controller built into Kubernetes 1.25+. PS
+description: >-
+  Configures Kubernetes Pod Security Standards (Privileged, Baseline, Restricted)
+  enforced via the built-in Pod Security Admission (PSA) controller (Kubernetes
+  1.25+), including namespace labeling and enforce/audit/warn modes. Use when
+  hardening pod configurations against privilege escalation, migrating off
+  deprecated PodSecurityPolicy, or setting namespace-level pod security
+  enforcement.
 domain: cybersecurity
 subdomain: container-security
 tags: