Add Stim MPP stabilizer import

.github/workflows/pytest.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - uses: actions/setup-python@v6
         with:
@@ -33,7 +33,7 @@ jobs:
           uv-version: "0.11.16"
           enable-cache: true
 
-      - run: uv sync --locked --python ${{ matrix.python }} --extra dev
+      - run: uv sync --locked --python ${{ matrix.python }} --no-default-groups --extra dev --extra stim
 
       - run: uv run --no-sync pytest -m "not pyzx"
 
@@ -42,7 +42,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - uses: actions/setup-python@v6
         with:
@@ -53,6 +53,6 @@ jobs:
           uv-version: "0.11.16"
           enable-cache: true
 
-      - run: uv sync --locked --python 3.13 --extra dev --extra pyzx
+      - run: uv sync --locked --python 3.13 --no-default-groups --extra dev --extra pyzx --extra stim
 
       - run: uv run --no-sync pytest -m pyzx

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- **QEC Stim MPP Import**: Added utilities for building `StabilizerCode` inputs from Stim `MPP` layers, including sparse Stim qubit id mapping, coordinate import, multi-layer selection, detector/logical-observable import, and the optional `graphqomb[stim]` extra.
+
 ### Changed
 
 - **Development Tooling**: Use uv as the default dependency manager for local development, CI, documentation builds, and publishing workflows.

graphqomb/qec/__init__.py

@@ -0,0 +1 @@
+"""qec submodule."""