chore: add 'Use when…' and 'Trigger with…' phrases to skill description (#3) (#11)

Closes #3.

The frontmatter description told a human *what* the skill does
but lacked the convention phrases (`Use when …`, `Trigger with
…`) Claude uses to decide *when* to reach for the skill
autonomously. Without those phrases the skill sits in the
catalog but never runs unless explicitly named.

Rewrite the description into a folded YAML block (so the line
length stays readable) with three clauses, exactly matching the
audit issue's fix sketch:

* what it does — Run local Appium test scripts against Kobiton
  devices — guides you through app upload, device selection,
  capability parsing, and local execution.
* when to use it — Use when the user asks to run mobile tests
  on Kobiton, validate an APK or IPA on real devices, or kick
  off a Kobiton automation run from a local script directory.
* trigger phrasing — Trigger with 'run kobiton tests' or
  'execute on kobiton devices'.

Done-when checklist:

* [x] description contains one `Use when …` phrase
* [x] description contains one `Trigger with "…"` phrase
* [x] total length stays under 500 chars
* [x] `pnpm run validate` still passes

The other six frontmatter fields added in #1 / PR #10 are
unchanged.

Author: SAY-5

skills/run-automation-suite/SKILL.md

@@ -1,6 +1,12 @@
 ---
 name: run-automation-suite
-description: Run local Appium test scripts against Kobiton devices. Guides you through app upload, device selection, script capability parsing, and local execution.
+description: >-
+  Run local Appium test scripts against Kobiton devices — guides you through
+  app upload, device selection, capability parsing, and local execution.
+  Use when the user asks to run mobile tests on Kobiton, validate an APK or
+  IPA on real devices, or kick off a Kobiton automation run from a local
+  script directory. Trigger with "run kobiton tests" or "execute on kobiton
+  devices".
 ---
 
 ## Workflow