Add plugin integration docs with correct MCP tool names

Document that when installed as browse@saiden plugin, MCP server is
named 'context' and tools are accessed as mcp__context__*.

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

CLAUDE.md

@@ -103,6 +103,19 @@ browse-mcp
 
 The MCP server (`src/mcp.ts`) exposes all browser commands as tools. It uses stdio transport and auto-launches the browser on first command.
 
+### Plugin Integration
+
+When installed as a Claude Code plugin (`browse@saiden`), the MCP server is named `context`. Tools are accessed as:
+
+- `mcp__context__goto` - Navigate to URL
+- `mcp__context__query` - Query elements by CSS selector
+- `mcp__context__click` - Click an element
+- `mcp__context__type` - Type into an input field
+- `mcp__context__screenshot` - Take a screenshot
+- `mcp__context__close` - Close the browser
+
+The plugin also provides slash commands: `/browse:start`, `/browse:goto`, `/browse:end`, etc.
+
 ### Debugging Tools
 
 ```bash