Resolve remaining Python issues

Author: greenc-FNAL

.actrc

@@ -0,0 +1 @@
+-P ubuntu-latest=catthehacker/ubuntu:act-latest

.github/copilot-instructions.md

@@ -138,3 +138,19 @@ All Markdown files must strictly follow these markdownlint rules:
     1.  Run tests with `LLVM_PROFILE_FILE` set (e.g., `export LLVM_PROFILE_FILE="profraw/%m-%p.profraw"`).
     2.  Merge profiles: `llvm-profdata merge -sparse profraw/*.profraw -o coverage.profdata`.
     3.  Generate report: `llvm-cov show -instr-profile=coverage.profdata -format=html ...`
+
+### Local GitHub Actions Testing (`act`)
+
+- **Tool**: Use `act` to run GitHub Actions workflows locally.
+- **Configuration**: Ensure `.actrc` exists in the workspace root with the following content to use a compatible runner image:
+  ```text
+  -P ubuntu-latest=catthehacker/ubuntu:act-latest
+  ```
+- **Usage**:
+  - List jobs: `act -l`
+  - Run specific job: `act -j <job_name>` (e.g., `act -j python-check`)
+  - Run specific event: `act pull_request`
+- **Troubleshooting**:
+  - **Docker Socket**: `act` requires access to the Docker socket. In dev containers, this may require specific mount configurations or permissions.
+  - **Artifacts**: `act` creates a `phlex-src` directory (or similar) for checkout. Ensure this is cleaned up or ignored by tools like `mypy`.
+

test/python/test_types.py

@@ -8,6 +8,12 @@
 import numpy.typing as npt
 
 
+class double(float):  # noqa: N801
+    """Dummy class for C++ double type."""
+
+    pass
+
+
 def add_float(i: float, j: float) -> float:
     """Add two floats.
 
@@ -21,7 +27,7 @@ def add_float(i: float, j: float) -> float:
     return i + j
 
 
-def add_double(i: "double", j: "double") -> "double":
+def add_double(i: double, j: double) -> double:
     """Add two doubles.
 
     Args:
@@ -31,10 +37,10 @@ def add_double(i: "double", j: "double") -> "double":
     Returns:
         float: Sum of the two inputs.
     """
-    return i + j
+    return double(i + j)
 
 
-def add_unsigned(i: "unsigned int", j: "unsigned int") -> "unsigned int":
+def add_unsigned(i: "unsigned int", j: "unsigned int") -> "unsigned int":  # type: ignore  # noqa: F722
     """Add two unsigned integers.
 
     Args:
@@ -60,7 +66,7 @@ def collect_float(i: float, j: float) -> npt.NDArray[np.float32]:
     return np.array([i, j], dtype=np.float32)
 
 
-def collect_double(i: "double", j: "double") -> npt.NDArray[np.float64]:
+def collect_double(i: double, j: double) -> npt.NDArray[np.float64]:
     """Combine doubles into a numpy array.
 
     Args: