📦 convert repo to Claude Code plugin

Move skills/ to repo root and add .claude-plugin/{plugin,marketplace}.json
so the skills can be installed in other projects via a local marketplace.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -0,0 +1,14 @@
+{
+  "name": "ai-skills",
+  "owner": {
+    "name": "Gabor Körber",
+    "email": "gab@g4b.org"
+  },
+  "plugins": [
+    {
+      "name": "ai-skills",
+      "source": "./",
+      "description": "Personal Claude Code skills: workpad, research-tree, implementation-orchestration, markdown-embedded-svg"
+    }
+  ]
+}

.claude-plugin/plugin.json

@@ -0,0 +1,9 @@
+{
+  "name": "ai-skills",
+  "version": "0.1.0",
+  "description": "Gabor's personal Claude Code skills (workpad, research-tree, implementation-orchestration, markdown-embedded-svg)",
+  "author": {
+    "name": "Gabor Körber",
+    "email": "gab@g4b.org"
+  }
+}