fix(kyberforge): apply audit findings across skill factory trio

- skill-audit: promote internal-working gotcha to ## Gotchas section;
  narrow cross-plugin path check to exclude tests/ (dev-only, repo-level
  deps are expected); require tests/README.md to declare that dependency
- skill-write/skill-improve: reorder descriptions to lead with "Use when..."
  for consistency with skill-audit and the agentskills.io spec trigger pattern
- skill-write: add tests/README.md with self-contained bats setup instructions;
  remove cross-skill reference to skill-audit's tests/README.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/kyberforge/skills/skill-improve/SKILL.md

@@ -1,15 +1,15 @@
 ---
 name: skill-improve
 description: >
-  Apply evidence-based improvements to an existing skill. Use when the user
-  says "improve this skill", "fix this skill based on feedback", "apply these
-  audit findings", or "update the skill based on this grill output". Also use
-  when the user provides inline feedback about a skill's behavior and wants it
-  applied, or when a grill session, eval run, or audit has produced findings
-  the user wants acted on — even if they don't say "improve" explicitly. Do
-  not use when the user wants a read-only review only — use /skill-audit
-  instead. Do not use when no improvement signals are present in the
-  conversation or referenced files.
+  Use when the user says "improve this skill", "fix this skill based on
+  feedback", "apply these audit findings", or "update the skill based on this
+  grill output". Also use when the user provides inline feedback about a skill's
+  behavior and wants it applied, or when a grill session, eval run, or audit has
+  produced findings the user wants acted on — even if they don't say "improve"
+  explicitly. Applies evidence-based improvements to an existing skill. Do not
+  use when the user wants a read-only review only — use /skill-audit instead.
+  Do not use when no improvement signals are present in the conversation or
+  referenced files.
 allowed-tools: Bash Read Write Edit
 metadata:
   category: factory