Create wiki page 'Development and CI'

Development-and-CI.md

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+# Development and CI
+
+## Local development
+
+Install development dependencies:
+
+```bash
+uv sync --group dev
+```
+
+Useful commands:
+
+```bash
+make format
+make lint
+make typecheck
+make test
+make ci-check
+make build
+make package-version
+```
+
+## Tooling
+
+- Ruff for linting and formatting
+- mypy in strict mode
+- pytest for tests
+- deptry for dependency checks
+- local `stubs` directory for untyped third-party packages
+
+## Architecture
+
+Project layout:
+
+- `src/yt_shorts_downloader/api.py`: public API
+- `src/yt_shorts_downloader/cli.py`: CLI
+- `src/yt_shorts_downloader/models`: typed models
+- `src/yt_shorts_downloader/services`: session validation
+- `src/yt_shorts_downloader/core`: yt-dlp integration, runtime detection, URL validation
+- `stubs`: local typing stubs
+
+## CI workflow
+
+The main Gitea Actions workflow runs:
+
+- Ruff
+- mypy
+- deptry
+- pytest
+
+After successful CI on a push to `main`, the workflow attempts publication to Gitea Packages.
+
+## Package publishing
+
+The package version is read from `[project].version` in `pyproject.toml`.
+
+Publishing rules:
+
+- if the current version does not exist in Gitea Packages, it is uploaded
+- if the current version already exists, upload is skipped
+- old published versions remain available in the registry
+
+Required CI secrets:
+
+- `PYPI_REPOSITORY_URL`
+- `PACKAGE_USERNAME`
+- `PACKAGE_TOKEN`
+
+Local publish example:
+
+```bash
+export PYPI_REPOSITORY_URL='https://gitea.example.com/api/packages/<owner>/pypi'
+export PACKAGE_USERNAME='<username>'
+export PACKAGE_TOKEN='<token>'
+
+make package-version
+make publish-gitea
+```