feat: add kyberforge plugin and rename plugin-create skill

Scaffolds the kyberforge marketplace management plugin (create-plugin and
marketplace-architect skills will live here). Renames the plugin-create
skill directory to create-plugin to match the canonical kebab-order convention.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/kyberforge/hooks/README.md

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+# hooks/
+
+**Claude Code only.** Hook definitions that run in response to Claude Code events.
+
+The `hooks.json` in this directory is read by Claude Code. Structure:
+
+```json
+{
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Bash",
+        "hooks": [
+          { "type": "command", "command": "echo 'tool used'" }
+        ]
+      }
+    ]
+  }
+}
+```
+
+Supported events: `PreToolUse`, `PostToolUse`, `Notification`, `Stop`.
+
+Use `${CLAUDE_PLUGIN_ROOT}` to reference scripts inside this plugin — the plugin runs
+from a cache path after install, not its original repo location.
+
+For GitHub Copilot CLI hooks, see `hooks.json` at the plugin root.

plugins/kyberforge/hooks/hooks.json

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+{
+  "hooks": {}
+}