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/examples/knowledge-base/.claude-plugin/plugin.json

@@ -0,0 +1,48 @@
+{
+  "name": "knowledge-base",
+  "version": "1.0.0",
+  "description": "AI-powered knowledge base with semantic search",
+  "author": "Your Name",
+  "license": "MIT",
+  "repository": "https://github.com/yourusername/claude-knowledge-base",
+  "claude": {
+    "permissions": [
+      "read:files",
+      "write:files",
+      "execute:commands"
+    ],
+    "commands": [
+      {
+        "name": "knowledge:add",
+        "description": "Add knowledge entries to your knowledge base",
+        "handler": "commands/add.ts",
+        "permissions": ["write:files"]
+      },
+      {
+        "name": "knowledge:search",
+        "description": "Search your knowledge base with semantic understanding",
+        "handler": "commands/search.ts",
+        "permissions": ["read:files"]
+      },
+      {
+        "name": "knowledge:list",
+        "description": "List all knowledge entries",
+        "handler": "commands/list.ts",
+        "permissions": ["read:files"]
+      },
+      {
+        "name": "knowledge:export",
+        "description": "Export knowledge base to various formats",
+        "handler": "commands/export.ts",
+        "permissions": ["read:files"]
+      }
+    ],
+    "hooks": [
+      {
+        "event": "SessionEnd",
+        "handler": "hooks/auto-save.ts",
+        "priority": 10
+      }
+    ]
+  }
+}