feat(kyberforge): add skill-author, merging skill-write and skill-improve

Closes #5. Single authoring skill replaces the factory trio — one set of
standards, one script, one place for future governance rules. Routes to
create or improve flow based on context. Passes skill-audit with no findings.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016z2ZFYHQCex8yZAMVMTZzZ

plugins/kyberforge/skills/skill-author/tests/README.md

@@ -0,0 +1,28 @@
+# 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). The test files load
+helpers from the repo root's `tests/test_helper/`.
+
+From the repo root:
+
+```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 for this skill (from the repo root):
+
+```bash
+bats plugins/kyberforge/skills/skill-author/tests/
+```
+
+## Files
+
+| File | Purpose |
+|------|---------|
+| `new-skill.bats` | Bats test suite for `scripts/new-skill.sh` |