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-azure-defender-for-cloud/SKILL.md

@@ -1,9 +1,11 @@
 ---
 name: implementing-azure-defender-for-cloud
-description: 'Implementing Microsoft Defender for Cloud to enable cloud security posture
-  management, workload protection across VMs, containers, databases, and storage,
-  configure security recommendations, and set up adaptive security controls with automated
-  remediation.
+description: 'Enable Microsoft Defender for Cloud (CSPM + CWPP) across VMs, containers,
+  SQL, storage, and Key Vault, using Azure Policy for evaluation, Log Analytics for
+  telemetry, Azure Arc for hybrid coverage, and Logic Apps for automated response.
+  Use for Azure security monitoring, adaptive remediation, or regulatory compliance
+  assessment; not for non-Azure-only protection or identity defense (Defender for
+  Identity).
 
   '
 domain: cybersecurity