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/exploiting-race-condition-vulnerabilities/SKILL.md

@@ -1,8 +1,10 @@
 ---
 name: exploiting-race-condition-vulnerabilities
-description: Detect and exploit race condition vulnerabilities in web applications
-  using Turbo Intruder's single-packet attack technique to bypass rate limits, duplicate
-  transactions, and exploit time-of-check-to-time-of-use flaws.
+description: Detects and exploits race condition (TOCTOU) vulnerabilities in web
+  applications using Burp Suite's Turbo Intruder extension and its single-packet
+  attack technique to fire parallel requests that bypass rate limits, duplicate
+  transactions, or overrun usage limits. Use when pentesting endpoints with balances,
+  coupon redemption, or rate limiting that concurrent requests might manipulate.
 domain: cybersecurity
 subdomain: web-application-security
 tags: