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-audit/tests/README.md

@@ -0,0 +1,26 @@
+# tests/
+
+Test files for scripts bundled with this skill.
+
+## Dependencies
+
+Tests require [bats-support](https://github.com/bats-core/bats-support) and
+[bats-assert](https://github.com/bats-core/bats-assert) installed under
+`tests/test_helper/`:
+
+```bash
+git clone https://github.com/bats-core/bats-support tests/test_helper/bats-support
+git clone https://github.com/bats-core/bats-assert tests/test_helper/bats-assert
+```
+
+Run all tests:
+
+```bash
+bats tests/
+```
+
+## Files
+
+| File | Purpose |
+|------|---------|
+| `validate.bats` | Bats test suite for `scripts/validate.sh` |