fix: restore build config and use PyPI README

Author: qectorlab

pyproject.toml

@@ -6,13 +6,13 @@ build-backend = "maturin"
 name = "qector-decoder-v3"
 version = "0.5.0"
 description = "Source-available Rust/Python QEC R&D platform: PyMatching-compatible validation, belief-matching, BP-OSD (LDPC/qLDPC), CPU/GPU batch decoding, and artifact-hashed benchmark evidence"
-readme = "README.md"
+readme = {file = "PYPI_README.md", content-type = "text/markdown"}
 requires-python = ">=3.9"
 license = {file = "LICENSE"}
 authors = [
     {name = "Guillaume Lessard / iD01t Productions", email = "admin@qector.store"}
 ]
-keywords = ["quantum", "error correction", "decoder", "union-find", "QEC", "rust"]
+keywords = ["quantum", "error correction", "decoder", "union-find", "QEC", "rust", "MWPM", "Stim", "PyMatching", "LDPC", "qLDPC"]
 classifiers = [
     "Development Status :: 4 - Beta",
     "Intended Audience :: Science/Research",
@@ -77,4 +77,64 @@ all = [
 Homepage = "https://www.qector.store"
 Repository = "https://github.com/GuillaumeLessard/qector-decoder.git"
 Issues = "https://github.com/GuillaumeLessard/qector-decoder/issues"
+Documentation = "https://github.com/GuillaumeLessard/qector-decoder#readme"
 "Commercial licensing" = "https://www.qector.store"
+
+[tool.maturin]
+python-source = "python"
+module-name = "qector_decoder_v3.qector_decoder_v3"
+manifest-path = "Cargo.toml"
+# Exclude all Rust source from sdist / wheel metadata -- compiled .so/.pyd only.
+# The src/ in this repo contains only a stub compile_error! placeholder.
+# The real source is injected at CI build time via encrypted Actions secrets.
+exclude = [
+  "src/**",
+  "tests/**",
+  "actions-runner/**",
+  "artifacts/**",
+  "target/**",
+  ".venv/**",
+]
+# Strip debug symbols from compiled extension
+strip = true
+
+[tool.pytest.ini_options]
+testpaths = ["python/tests"]
+python_files = ["test_*.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+filterwarnings = [
+    # Starlette's TestClient warns that httpx is deprecated in favor of httpx2;
+    # this is upstream noise, not actionable from this project.
+    "ignore::starlette.exceptions.StarletteDeprecationWarning",
+]
+
+[tool.mypy]
+python_version = "3.10"
+warn_return_any = true
+warn_unused_configs = true
+ignore_missing_imports = true
+
+[tool.ruff]
+line-length = 120
+target-version = "py39"
+
+[tool.ruff.lint]
+# E702: semicolons used intentionally for chained one-liners in plotting helpers.
+# E731: lambda assignments used for compact callback tables in a few helpers.
+# E741: single-letter variable names (l, I, O) are domain-conventional in QEC math.
+# These are minor style choices that do not affect correctness.
+ignore = ["E702", "E731", "E741"]
+
+[tool.ruff.lint.per-file-ignores]
+# __init__: late imports (E402) are intentional (runtime optional deps).
+"python/qector_decoder_v3/__init__.py" = ["E402"]
+# workbench.py: json imported for optional serialization path, Tuple aliased for py3.8 compat.
+"python/qector_decoder_v3/workbench.py" = ["F401"]
+# qiskit_plugin.py: Tuple re-exported for downstream type annotations.
+"python/qector_decoder_v3/qiskit_plugin.py" = ["F401"]
+# Test files: many use sys.path manipulation (E402), conditional imports (F401),
+# convenience imports kept for symmetry (F401), unused locals in scaffolding (F841),
+# f-strings used as comment-like strings for readability (F541).
+"python/tests/*.py" = ["E402", "F401", "F541", "F841"]
+"python/tests/**/*.py" = ["E402", "F401", "F541", "F841"]