Add system resource detection, Docker execution skill, and environment-aware recommendations

- TUI header now shows CPU cores, RAM, GPU, and Docker availability
- System prompt uses resource info to recommend execution environments
- Docker skill for running experiment code in isolated containers
- Renamed docker-sandbox skill to docker (Feynman stays on host, code runs in containers)
- Updated README and website to cite Docker alongside Agent Computer

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

skills-lock.json

@@ -0,0 +1,10 @@
+{
+  "version": 1,
+  "skills": {
+    "find-skills": {
+      "source": "vercel-labs/skills",
+      "sourceType": "github",
+      "computedHash": "d31e234f0c90694a670222cdd1dafa853e051d7066beda389f1097c22dadd461"
+    }
+  }
+}