fix(kyberforge): align skill factory with agentskills.io spec on directory rules

Move test infrastructure (validate.bats, new-skill.bats) from scripts/ to
tests/ — the spec defines scripts/ as executable code agents can run, so
test files don't belong there. Add tests/README.md placeholders with
bats-support dependency declaration.

Update skill-audit to permit tests/ and flag other unlisted directories,
add scripts/ purpose check, and add /skill-improve near-miss exclusion.
Update skill-improve and skill-write to cover tests/ in directory lists,
scaffold template, and authoring guidance.

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

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

@@ -138,7 +138,7 @@ If the skill needs scripts with external package dependencies or language-specif
 
 If no scripts are needed, delete `scripts/README.md` and the `scripts/` directory.
 
-## Step 4 — Add references and assets (if needed)
+## Step 4 — Add references, assets, and tests (if needed)
 
 **`references/`** — additional documentation loaded on demand. One topic per file.
 Reference conditionally from SKILL.md: `If <condition>, read references/<file>.md`.
@@ -146,6 +146,10 @@ Reference conditionally from SKILL.md: `If <condition>, read references/<file>.m
 **`assets/`** — static resources: templates, schemas, lookup tables.
 Reference by relative path from SKILL.md.
 
+**`tests/`** — test files for scripts in `scripts/`. Use when scripts are complex
+enough to break silently. Test infrastructure (`.bats`, `*_test.*`) belongs here,
+not in `scripts/`. See `tests/README.md` for setup instructions.
+
 If not needed, delete the placeholder READMEs and their directories.
 
 ## Step 5 — Validate