chore: migrate legacy pre-commit hook to .pre-commit-config.yaml

Replaces shell script (.git/hooks/pre-commit.legacy) with ecosystem-managed pre-commit framework:
- gitleaks/gitleaks: secret scanning
- jumanjihouse/pre-commit-hooks: shellcheck wrapper
- pre-commit/pre-commit-hooks: JSON/YAML validation, end-of-file-fixer, trailing-whitespace
- local hooks: SKILL.md frontmatter validation

Uses pinned versions for reproducibility across environments. Includes auto-fixes from hook runs (formatting, trailing whitespace, JSON beautification).

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

plugins/kyberforge/docs/research/examples/skill-write/skill-creator/LICENSE.txt

@@ -199,4 +199,4 @@
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
-   limitations under the License.
+   limitations under the License.

plugins/kyberforge/docs/research/examples/skill-write/skill-creator/scripts/improve_description.py

@@ -137,7 +137,7 @@ Here are some tips that we've found to work well in writing these descriptions:
 - The description competes with other skills for Claude's attention — make it distinctive and immediately recognizable.
 - If you're getting lots of failures after repeated attempts, change things up. Try different sentence structures or wordings.
 
-I'd encourage you to be creative and mix up the style in different iterations since you'll have multiple opportunities to try different approaches and we'll just grab the highest-scoring one at the end. 
+I'd encourage you to be creative and mix up the style in different iterations since you'll have multiple opportunities to try different approaches and we'll just grab the highest-scoring one at the end.
 
 Please respond with only the new description text in <new_description> tags, nothing else."""
 

plugins/kyberforge/docs/research/examples/skill-write/skill-creator/scripts/quick_validate.py

@@ -97,7 +97,7 @@ if __name__ == "__main__":
     if len(sys.argv) != 2:
         print("Usage: python quick_validate.py <skill_directory>")
         sys.exit(1)
-    
+
     valid, message = validate_skill(sys.argv[1])
     print(message)
-    sys.exit(0 if valid else 1)
+    sys.exit(0 if valid else 1)