chore: Remove dss-claude-plugin directory

Removing obsolete plugin directory after consolidation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

dss-claude-plugin/.mcp.json

@@ -1,22 +0,0 @@
-{
-  "x-immutable-notice": {
-    "protected": true,
-    "reason": "MCP server configuration - maintains Claude Code integration stability",
-    "lastModified": "2025-12-09",
-    "bypassMethod": "Use 'DSS_IMMUTABLE_BYPASS=1 git commit' or commit message '[IMMUTABLE-UPDATE] reason'"
-  },
-  "mcpServers": {
-    "dss": {
-      "command": "python3",
-      "args": ["${CLAUDE_PLUGIN_ROOT}/servers/dss-mcp-server.py"],
-      "env": {
-        "PYTHONPATH": "${CLAUDE_PLUGIN_ROOT}/..:${CLAUDE_PLUGIN_ROOT}",
-        "DSS_HOME": "${CLAUDE_PLUGIN_ROOT}/../.dss",
-        "DSS_DATABASE": "${CLAUDE_PLUGIN_ROOT}/../.dss/dss.db",
-        "DSS_CACHE": "${CLAUDE_PLUGIN_ROOT}/../.dss/cache",
-        "DSS_BASE_PATH": "${CLAUDE_PLUGIN_ROOT}/.."
-      },
-      "description": "Design System Server MCP server providing design token and component analysis tools"
-    }
-  }
-}