Refactor: Remove outdated security requirements and best practice templates

- Deleted security requirements specification file to streamline documentation.
- Removed best practice finding template to enhance clarity and focus on critical issues.
- Eliminated report template and security finding template to reduce redundancy and improve maintainability.
- Updated skill generator templates to enforce mandatory prerequisites for better compliance with design standards.
- Bumped package version from 6.3.18 to 6.3.23 for dependency updates.

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "claude-code-workflow",
-  "version": "6.3.18",
+  "version": "6.3.23",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "claude-code-workflow",
-      "version": "6.3.18",
+      "version": "6.3.23",
       "license": "MIT",
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.0.4",