fix(build): declare hatchling wheel file selection for flat layout (#2)

pip install -e . failed with 'Unable to determine which files to ship
inside the wheel' — the flat layout has no directory matching the
project name (autocad_mcp_pro). Ship server.py plus its root-level
imports (config.py, security.py) and the backends/ and engineering/
packages explicitly.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

pyproject.toml

@@ -39,6 +39,11 @@ dev-dependencies = [
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
+[tool.hatch.build.targets.wheel]
+# Flat layout: no directory matches the project name, so hatchling needs an
+# explicit file selection (GH issue #2). server.py imports config + security.
+only-include = ["server.py", "config.py", "security.py", "backends", "engineering"]
+
 [tool.ruff]
 line-length = 100
 target-version = "py311"