lukisch · Oct 31, 2026
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - name: Check out repository
@@ -100,7 +100,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest]
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - name: Check out repository

diff --git a/.gitignore b/.gitignore
@@ -31,11 +31,17 @@ tools/
 
 # Release artifacts
 releases/
+dist/
+build/
 *.zip
 *.exe
 *.msix
 SHA256SUMS.txt
 
+# Marketing & automation logs (never track in repository per GITHUB-POLICY)
+MARKETING-LOG.txt
+*.receipt.json
+
 # Sync & patch artifacts
 *.sync-conflict-*
 *.conflict

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -54,6 +54,13 @@ Format: [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ### Maintenance
 
+- **Technical Hygiene, PEP 639 License Standardization & Git Tracking Protection (2026-10-31)**:
+  - **Git Tracking Protection & .gitignore Hardening**: Untracked `MARKETING-LOG.txt` from git repository index and updated `.gitignore` to strictly exclude `MARKETING-LOG.txt`, `*.receipt.json`, `dist/`, and `build/`, enforcing GITHUB-POLICY zero-pollution requirements.
+  - **PEP 639 License Compliance**: Modernized `pyproject.toml` with `license = "MIT"` and `license-files = ["LICENSE"]`, removing redundant `"License :: OSI Approved :: MIT License"` classifier to prevent `InvalidConfigError` in modern setuptools, and declared Python 3.13 support.
+  - **CI Workflow Hardening**: Expanded multi-OS `source-smoke` and Windows test matrices in `.github/workflows/tests.yml` to include Python 3.13.
+  - **Contract Test Suite Expansion**: Updated `tests/test_metadata.py` with automated assertions for PEP 639 license structure, absence of conflicting OSI classifiers, `.gitignore` log protection, and untracked status of `MARKETING-LOG.txt` (106/106 tests passing, 100% green).
+
+
 - **Technical Hygiene, CI Workflow Hardening & Metadata Contract Suite (2026-09-06)**:
   - **CI Workflow Hardening**: Upgraded `.github/workflows/tests.yml` to official stable actions (`actions/checkout@v4`, `actions/setup-python@v5` with pip cache), added concurrency control with `cancel-in-progress: true`, added a dedicated `ruff check .` linting gate on Windows, and added a multi-OS `source-smoke` matrix job across Ubuntu and macOS for Python 3.10-3.12 executing `source_platform_smoke.py` and `test_source_platform_smoke_contract.py`.
   - **PEP 621 Metadata**: Enhanced `pyproject.toml` with standard classifiers (`Environment :: Win32 (MS Windows)`, `Environment :: X11 Applications :: Qt`, `Topic :: Communications :: Email`, `Topic :: Desktop Environment`, `Topic :: Utilities`), complete ecosystem URLs (Homepage, Repository, Bug Tracker, Changelog, Documentation, Security, Parent Organization, Umbrella Ecosystem), and `[tool.ruff]` configuration.

diff --git a/MARKETING-LOG.txt b/MARKETING-LOG.txt
diff --git a/README-DE.md b/README-DE.md
@@ -13,7 +13,7 @@ System-Tray-Launcher für die drei Universal Mail Tools.
 [![Python 3.10+](https://img.shields.io/badge/python-3.10%2B-blue.svg)](https://www.python.org/downloads/)
 [![Plattform: Windows](https://img.shields.io/badge/plattform-Windows%20(System--Tray)-0078D6.svg?logo=windows&logoColor=white)](https://github.com/doc-bricks/MailProcessor)
 [![GUI: PySide6 Qt](https://img.shields.io/badge/GUI-PySide6%20Qt-41CD52.svg?logo=qt&logoColor=white)](https://pypi.org/project/PySide6/)
-[![Tests: 90 bestanden](https://img.shields.io/badge/tests-90%20bestanden-brightgreen.svg)](tests/)
+[![Tests: 106 bestanden](https://img.shields.io/badge/tests-106%20bestanden-brightgreen.svg)](tests/)
 [![Sicherheit: Richtlinie](https://img.shields.io/badge/sicherheit-SECURITY.md-blue.svg)](SECURITY.md)
 [![Sicherheits-SLA: 48h Reaktion](https://img.shields.io/badge/sicherheits--SLA-48h%20Reaktion-blue.svg)](SECURITY.md)
 [![Datenschutzhinweis: Entwurf](https://img.shields.io/badge/datenschutz-hinweis%20entwurf-blue.svg)](docs/PRIVACY_POLICY_DRAFT.md)

diff --git a/README.md b/README.md
@@ -13,7 +13,7 @@ System tray launcher for the three Universal Mail Tools.
 [![Python 3.10+](https://img.shields.io/badge/python-3.10%2B-blue.svg)](https://www.python.org/downloads/)
 [![Platform: Windows](https://img.shields.io/badge/platform-Windows%20(System%20Tray)-0078D6.svg?logo=windows&logoColor=white)](https://github.com/doc-bricks/MailProcessor)
 [![GUI: PySide6 Qt](https://img.shields.io/badge/GUI-PySide6%20Qt-41CD52.svg?logo=qt&logoColor=white)](https://pypi.org/project/PySide6/)
-[![Tests: 90 passed](https://img.shields.io/badge/tests-90%20passed-brightgreen.svg)](tests/)
+[![Tests: 106 passed](https://img.shields.io/badge/tests-106%20passed-brightgreen.svg)](tests/)
 [![Security: Policy](https://img.shields.io/badge/security-SECURITY.md-blue.svg)](SECURITY.md)
 [![Security SLA: 48h Response](https://img.shields.io/badge/security%20SLA-48h%20response-blue.svg)](SECURITY.md)
 [![Privacy notice: draft](https://img.shields.io/badge/privacy-notice%20draft-blue.svg)](docs/PRIVACY_POLICY_DRAFT.md)

diff --git a/pyproject.toml b/pyproject.toml
@@ -8,7 +8,8 @@ version = "0.1.0"
 description = "Local-first Windows tray launcher hub for doc-bricks Universal Mail Tools"
 readme = "README.md"
 requires-python = ">=3.10"
-license = {text = "MIT"}
+license = "MIT"
+license-files = ["LICENSE"]
 authors = [
     {name = "doc-bricks"}
 ]
@@ -26,12 +27,12 @@ classifiers = [
     "Environment :: Win32 (MS Windows)",
     "Environment :: X11 Applications :: Qt",
     "Intended Audience :: End Users/Desktop",
-    "License :: OSI Approved :: MIT License",
     "Operating System :: Microsoft :: Windows",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Communications :: Email",
     "Topic :: Desktop Environment",
     "Topic :: Utilities",

diff --git a/tests/test_metadata.py b/tests/test_metadata.py
@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+import subprocess
+
 try:
     import tomllib
 except ModuleNotFoundError:
@@ -38,6 +40,7 @@ def test_ci_workflow_integrity():
     assert '"3.10"' in workflow_content
     assert '"3.11"' in workflow_content
     assert '"3.12"' in workflow_content
+    assert '"3.13"' in workflow_content
 
     # Quality and test steps
     assert "ruff check ." in workflow_content
@@ -46,34 +49,39 @@ def test_ci_workflow_integrity():
 
 
 def test_pyproject_pep621_metadata():
-    """Verify pyproject.toml PEP 621 compliance, classifiers, and ecosystem URLs."""
+    """Verify pyproject.toml PEP 621/639 compliance, classifiers, and ecosystem URLs."""
     raw_toml = _read_file("pyproject.toml")
     data = tomllib.loads(raw_toml)
 
     project = data.get("project", {})
     assert project.get("name") == "doc-bricks-mailprocessor"
     assert project.get("version") == "0.1.0"
-    assert project.get("license", {}).get("text") == "MIT"
+    assert project.get("license") == "MIT"
+    assert project.get("license-files") == ["LICENSE"]
 
     classifiers = project.get("classifiers", [])
     expected_classifiers = [
         "Development Status :: 4 - Beta",
         "Environment :: Win32 (MS Windows)",
         "Environment :: X11 Applications :: Qt",
         "Intended Audience :: End Users/Desktop",
-        "License :: OSI Approved :: MIT License",
         "Operating System :: Microsoft :: Windows",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Topic :: Communications :: Email",
         "Topic :: Desktop Environment",
         "Topic :: Utilities",
     ]
     for clf in expected_classifiers:
         assert clf in classifiers, f"Classifier '{clf}' missing from pyproject.toml"
 
+    # PEP 639 rule: License string in project must not co-exist with OSI classifiers
+    assert "License :: OSI Approved :: MIT License" not in classifiers
+    assert not any(clf.startswith("License ::") for clf in classifiers)
+
     urls = project.get("urls", {})
     expected_urls = {
         "Homepage": "https://github.com/doc-bricks/MailProcessor",
@@ -158,11 +166,32 @@ def test_gitignore_integrity():
         "*.conflict",
         "*-CONFLIT-*",
         "LOCK*.txt",
+        "MARKETING-LOG.txt",
+        "*.receipt.json",
+        "dist/",
+        "build/",
     ]
     for entry in required_entries:
         assert entry in gitignore_content, f"Entry '{entry}' missing from .gitignore"
 
 
+def test_marketing_log_not_tracked_and_policy_compliant():
+    """Verify MARKETING-LOG.txt is untracked in git repository and ignored per GITHUB-POLICY."""
+    gitignore_content = _read_file(".gitignore")
+    assert "MARKETING-LOG.txt" in gitignore_content
+    assert "*.receipt.json" in gitignore_content
+
+    # If git is available, verify git ls-files does not track MARKETING-LOG.txt
+    res = subprocess.run(
+        ["git", "ls-files", "MARKETING-LOG.txt"],
+        cwd=str(ROOT),
+        capture_output=True,
+        text=True,
+    )
+    if res.returncode == 0:
+        assert res.stdout.strip() == "", "MARKETING-LOG.txt must not be tracked in git repository"
+
+
 def test_readme_bilingual_parity():
     """Verify README.md and README-DE.md cross-linking, badges, and structure."""
     readme_en = _read_file("README.md")
@@ -196,7 +225,7 @@ def test_readme_bilingual_parity():
 
     # Governance invariants in both
     expected_invariants = [
-            "INV-DATA-01",
+        "INV-DATA-01",
         "INV-NOELEV-02",
         "INV-ZIPSLIP-03",
         "INV-CFGISO-04",