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-write/SKILL.md

@@ -1,14 +1,14 @@
 ---
 name: skill-write
 description: >
-  Author a new skill following the agentskills.io specification — scaffold the
-  directory structure from annotated templates, fill in SKILL.md and supporting
-  files, then validate the result. Use when the user wants to create a new skill
-  from scratch, says "write a skill for X", "build a skill that does Y", or
-  "create a SKILL.md for Z", or wants to make a workflow repeatable or shareable
-  as a reusable command. Performs best when preceded by a grill session and
-  domain research. Do not use to update an existing well-formed skill, write
-  evals, or author agent definition files.
+  Use when the user wants to create a new skill from scratch, says "write a skill
+  for X", "build a skill that does Y", or "create a SKILL.md for Z", or wants to
+  make a workflow repeatable or shareable as a reusable command. Authors a new
+  skill following the agentskills.io specification — scaffolds the directory
+  structure from annotated templates, fills in SKILL.md and supporting files, then
+  validates the result. Performs best when preceded by a grill session and domain
+  research. Do not use to update an existing well-formed skill, write evals, or
+  author agent definition files.
 allowed-tools: Bash Read Write
 metadata:
   category: factory