Revert "chore: Remove dss-claude-plugin directory"

This reverts commit 72cb7319f5.

dss-claude-plugin/core/skins/base.json

@@ -0,0 +1,28 @@
+{
+  "meta": {
+    "id": "base",
+    "version": "1.0.0",
+    "description": "Foundation tokens shared across all skins"
+  },
+  "tokens": {
+    "colors": {
+      "transparent": "transparent",
+      "current": "currentColor",
+      "white": "#ffffff",
+      "black": "#000000"
+    },
+    "spacing": {
+      "0": "0px",
+      "1": "4px",
+      "2": "8px",
+      "4": "16px",
+      "8": "32px"
+    },
+    "typography": {
+      "fontFamily": {
+        "sans": ["system-ui", "sans-serif"],
+        "mono": ["monospace"]
+      }
+    }
+  }
+}

dss-claude-plugin/core/skins/classic.json

@@ -0,0 +1,21 @@
+{
+  "meta": {
+    "id": "classic",
+    "version": "2.0.0",
+    "parent": "base"
+  },
+  "tokens": {
+    "colors": {
+      "primary": "#3B82F6",
+      "secondary": "#10B981",
+      "danger": "#EF4444",
+      "background": "#F3F4F6",
+      "surface": "#FFFFFF",
+      "text": "#1F2937"
+    },
+    "borderRadius": {
+      "default": "0.25rem",
+      "lg": "0.5rem"
+    }
+  }
+}

dss-claude-plugin/core/skins/workbench.json

@@ -0,0 +1,33 @@
+{
+  "meta": {
+    "id": "workbench",
+    "version": "2.0.0",
+    "parent": "base",
+    "description": "High density technical interface skin"
+  },
+  "tokens": {
+    "colors": {
+      "primary": "#2563EB",
+      "secondary": "#475569",
+      "danger": "#DC2626",
+      "background": "#0F172A",
+      "surface": "#1E293B",
+      "text": "#E2E8F0"
+    },
+    "spacing": {
+      "1": "2px",
+      "2": "4px",
+      "4": "8px",
+      "8": "16px"
+    },
+    "borderRadius": {
+      "default": "0px",
+      "lg": "2px"
+    },
+    "typography": {
+      "fontFamily": {
+        "sans": ["Inter", "system-ui", "sans-serif"]
+      }
+    }
+  }
+}