Revert "Add MCP tool for setting session token"

This reverts commit 9dadaad5ba.

mcp/src/openisle_mcp/server.py

@@ -139,25 +139,6 @@ app = FastMCP(
 )
 
 
-@app.tool(
-    name="set_token",
-    description=(
-        "Set JWT token for the current session to be reused by other tools."
-    ),
-)
-async def set_token(
-    token: Annotated[
-        str,
-        PydanticField(description="JWT token string."),
-    ],
-    ctx: Context | None = None,
-) -> str:
-    """Persist a JWT token for the active MCP session."""
-
-    session_token_manager.resolve(ctx, token)
-    return "Token stored successfully."
-
-
 @app.tool(
     name="search",
     description="Perform a global search across OpenIsle resources.",