doc first implementation

src/personal_mcp/skills/nicegui/server.py

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+from fastmcp import FastMCP
+
+from personal_mcp.skills.document_loader import load_skill_document
+
+nicegui_server = FastMCP("nicegui")
+
+
+@nicegui_server.resource("resource://skills/nicegui/document")
+def skill_document() -> dict[str, str]:
+    """Return the canonical Markdown document for this skill."""
+    return load_skill_document(skill_id="nicegui", skill_slug="nicegui")