feat: full upgrade to python3, tests, etc.

.github/CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation
+in our community a harassment-free experience for everyone, regardless
+of age, body size, visible or invisible disability, ethnicity, sex
+characteristics, gender identity and expression, level of experience,
+education, socio-economic status, nationality, personal appearance,
+race, caste, color, religion, or sexual identity and orientation.
+
+We pledge to act and interact in ways that contribute to an open,
+welcoming, diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment:
+- Demonstrating empathy and kindness
+- Being respectful of differing opinions
+- Gracefully accepting constructive feedback
+- Focusing on what is best for the community
+
+Examples of unacceptable behavior:
+- The use of sexualized language or imagery
+- Trolling, insulting or derogatory comments
+- Harassment of any kind
+- Publishing others’ private information
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our
+standards and will take appropriate and fair corrective action in
+response to any behavior they deem inappropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces and also
+applies when an individual is officially representing the project.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior
+may be reported to the project owner @ivuorinen.
+
+All complaints will be reviewed and investigated and will result in a
+response that is deemed necessary and appropriate to the circumstances.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][cc],
+version 2.1.
+
+[cc]: https://www.contributor-covenant.org/version/2/1/code_of_conduct/
+
+<!--
+vim: ft=md sw=2 ts=2 tw=72 fo=cqt wm=0 et
+-->

.github/CONTRIBUTING.md

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+# Contributing to aeonview
+
+Thanks for your interest in contributing to **aeonview**! This guide will help you get started.
+
+## 🛠 Project Setup
+
+1. Clone the repository:
+   ```bash
+   git clone https://github.com/your-username/aeonview.git
+   cd aeonview
+   ```
+
+2. Set up your environment:
+   ```bash
+   python3 -m venv venv
+   source venv/bin/activate
+   pip install -r dev-requirements.txt
+   ```
+
+3. Install pre-commit hooks:
+   ```bash
+   pre-commit install
+   ```
+
+## ✅ Development Workflow
+
+- Make sure your changes are **well-tested**.
+- Use `make check` to run linting and tests.
+- Follow the existing coding style (Ruff will enforce it).
+- All new features must include documentation.
+
+## 🧪 Running Tests
+
+```bash
+make test
+```
+
+## 🧹 Formatting & Linting
+
+```bash
+make format   # auto-format code
+make lint     # check for lint errors
+```
+
+## ✅ Submitting a Pull Request
+
+1. Create a feature branch:
+   ```bash
+   git checkout -b feature/my-new-feature
+   ```
+
+2. Commit your changes:
+   ```bash
+   git add .
+   git commit -m "feat: add support for X"
+   ```
+
+3. Push and open a pull request:
+   ```bash
+   git push origin feature/my-new-feature
+   ```
+
+4. Follow the PR template and link any relevant issues.
+
+## 📋 Commit Message Guidelines
+
+Use [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/):
+
+Examples:
+- `feat: add monthly video generation`
+- `fix: handle invalid date error`
+- `docs: update usage instructions`
+
+## 🙏 Code of Conduct
+
+We expect contributors to follow our [Code of Conduct](CODE_OF_CONDUCT.md).
+
+## Questions?
+Feel free to open an issue or start a discussion!
+
+Thanks for helping make Aeonview better 💜
+
+<!--
+vim: ft=md sw=2 ts=2 tw=72 fo=cqt wm=0 et
+-->

.github/renovate.json

@@ -0,0 +1,16 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "github>ivuorinen/renovate-config"
+  ],
+  "packageRules": [
+    {
+      "managers": [
+        "github-actions"
+      ],
+      "schedule": [
+        "daily"
+      ]
+    }
+  ]
+}

.github/workflows/pr-lint.yml

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+---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+name: PR Lint
+
+# yamllint disable-line rule:truthy
+on:
+  push:
+    branches: [master, main]
+  pull_request:
+    branches: [master, main]
+
+permissions: read-all
+
+env:
+  TRIVY_SEVERITY: CRITICAL,HIGH
+  DISABLE_LINTERS: GO_GOLANGCI_LINT
+
+jobs:
+  Linter:
+    name: PR Lint
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write # only for delete-branch option
+      issues: write
+      pull-requests: write
+      statuses: write
+
+    steps:
+      - uses: ivuorinen/actions/pr-lint@312c00f77fbd73948441c8b004607e098e40c97f # 25.4.8

.github/workflows/python-tests.yml

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+name: Python tests
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+
+permissions: read-all
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+    - name: Set up Python
+      uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236 # v4.7.1
+
+    - name: Install dependencies
+      shell: bash
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest pytest-cov ruff
+
+    - name: Run Ruff linting
+      shell: bash
+      run: ruff check .
+
+    - name: Run tests with coverage
+      shell: bash
+      run: |
+        pytest --cov=aeonview --cov-report=term-missing