Remove duplicate pyproject.toml, consolidate MCP deps

The src/core/pyproject.toml was unnecessary since src/pyproject.toml
already exists and properly packages openenv_core. MCP dependencies
(mcp, fastmcp) are now in the correct location.

Author: Darktex

src/core/pyproject.toml

@@ -25,6 +25,8 @@ dependencies = [
     "rich>=13.0.0",
     "tomli>=2.0.1",
     "tomli-w>=1.0.0",
+    "mcp>=1.0.0",
+    "fastmcp>=0.1.0",
 ]
 
 [project.optional-dependencies]