Reorganize: Move all skills to skills/ folder

- Created skills/ directory
- Moved 272 skills to skills/ subfolder
- Kept agents/ at root level
- Kept installation scripts and docs at root level

Repository structure:
- skills/           - All 272 skills from skills.sh
- agents/           - Agent definitions
- *.sh, *.ps1       - Installation scripts
- README.md, etc.   - Documentation

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

skills/plugins/claude-code-safety-net/ast-grep/rule-tests/no-dynamic-import-test.yml

@@ -0,0 +1,7 @@
+id: no-dynamic-import
+valid:
+  - "import { foo } from 'bar'"
+  - "import * as foo from 'bar'"
+invalid:
+  - "await import('bar')"
+  - "const foo = await import('bar')"