Move ue_mcp_server.py back to repo root

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -12,7 +12,7 @@ Implementation complete. Scripts live in `docgen/`:
 - `docgen/ue_parser.py` — Parses UE headers into dataclasses
 - `docgen/ue_markdown.py` — Renders parsed data as Markdown (ultra-compact format, documented items only)
 - `docgen/generate.py` — CLI entry point; two-pass pipeline (parse-all → build type index → render-all)
-- `docgen/ue_mcp_server.py` — MCP server exposing 5 tools for item-granularity doc lookups
+- `ue_mcp_server.py` — MCP server exposing 5 tools for item-granularity doc lookups
 - `.mcp.json` — Registers the MCP server with Claude Code (stdio transport)
 
 ## Usage
@@ -30,7 +30,7 @@ The last argument is always the output directory. All preceding arguments are in
 
 ## MCP Server
 
-`docgen/ue_mcp_server.py` exposes 5 tools Claude can call directly:
+`ue_mcp_server.py` exposes 5 tools Claude can call directly:
 
 | Tool | Purpose |
 |---|---|