docs: add setup-env skill for coding agents

.agents/skills/setup-env/SKILL.md

@@ -0,0 +1,45 @@
+---
+name: setup-env
+description: Use when setting up a fresh checkout of Selenium-Python-Example, restoring its Python environment, or diagnosing missing dependencies or Chrome before running pytest.
+---
+
+# Setup environment
+
+Run commands from the repository root. Follow the checked-in manifests and lockfile; preserve existing environments, credentials, and dependency versions.
+
+## Install
+
+Use `uv` (install it from https://docs.astral.sh/uv/getting-started/installation/ if missing).
+Inspect `pyproject.toml`, `uv.lock`, and `.github/workflows/pr.yml` first.
+The current CI uses Python 3.14; `~=3.11` allows newer Python 3.x.
+
+```bash
+uv python install 3.14
+uv sync --python 3.14 --locked --all-extras --dev
+```
+
+`uv sync` creates `.venv`; activation is unnecessary with `uv run`.
+If an existing environment uses another compatible Python, preserve it unless a change is needed.
+If locked sync fails, report the actual error; do not regenerate `uv.lock` or upgrade packages as a setup shortcut.
+
+Install Google Chrome using the operating system's supported installer if absent.
+Selenium Manager resolves the matching driver on first launch and may need network access.
+Do not install Playwright browsers or an unrelated global ChromeDriver.
+
+## Configure
+
+Inspect the selected tests and `tests/conftest.py` for required settings.
+The repository has no `.env.example`; do not attempt to copy one.
+If needed, create a root `.env` only when absent and populate it privately with user-provided values.
+Preserve existing values and confirm `.env` is ignored before adding credentials.
+
+Valid-login tests read `EMAIL` and `PASSWORD`; email tests also use
+`MAILINATOR_API_KEY` and `MAILINATOR_DOMAIN_NAME`.
+Database and visual regression tests require their own services; they are not setup prerequisites.
+Pass the target explicitly with pytest's `--base-url`; setting `BASE_URL` alone does not configure pytest.
+
+## Common problems
+
+- Browser download or registry access fails: report the destination and error; retain TLS verification and proxy settings.
+- Chrome reports missing Linux libraries: install the distribution's required Chrome dependencies.
+- Credentials or optional services are unavailable: complete installation and report which settings or services are missing.

README.md

@@ -72,6 +72,11 @@ This project implements the concepts discussed in the following **TestShift** ar
 
 ---
 
+
+## Agent environment setup
+
+For an AI coding agent, use the repository's [`setup-env` skill](.agents/skills/setup-env/SKILL.md) to install dependencies and prepare the browser. In Codex, invoke it with `$setup-env`.
+
 ## ⚙️ Getting Started
 
 ### 1. Clone