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-binary-exploitation-analysis/SKILL.md

@@ -1,8 +1,9 @@
 ---
 name: performing-binary-exploitation-analysis
-description: 'Analyze binary exploitation techniques including buffer overflows and
-  ROP chains using pwntools Python library. Covers checksec analysis, gadget discovery
-  with ROPgadget, and exploit development for CTF and authorized security assessments.
+description: 'Analyze ELF binaries for memory-corruption vulnerabilities and build proof-of-concept
+  exploits using pwntools, checksec, and ROPgadget for buffer overflows and ROP chains. Use
+  when a penetration test or CTF challenge requires evaluating compiler mitigations (NX, ASLR,
+  stack canaries, PIE, RELRO) or developing a working exploit to demonstrate impact.
 
   '
 domain: cybersecurity