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.devcontainer/README.md

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+# Dev Container – Local testing before deploy
+
+This devcontainer runs PHP 7.4 + Nginx (Debian-based image so Cursor’s tooling has bash). Your `src/` folder is mounted over the web root so edits are reflected immediately.
+
+## If “Reopen in Container” keeps failing (e.g. bash not found)
+
+Cursor may be reusing an old container. Remove it and reopen:
+
+1. **Reopen the folder locally** (not in the container).
+2. In a terminal:  
+   `docker rm -f 2476c6abaac7 2>/dev/null; docker ps -a | grep -i umlaut`  
+   and remove any listed dev container for this project.
+3. **Reopen in Container** again so a new container is created from the current image.
+
+## How to use
+
+1. **Open in Dev Container**  
+   Command Palette → **“Dev Containers: Reopen in Container”** (or use the prompt when opening the folder).
+
+2. **Wait for the container to build and start**  
+   First time it builds the image; later opens are fast.
+
+3. **Open the site in your browser**  
+   When the container is running, open **http://localhost** (port 80 is forwarded).  
+   - Main site: `http://localhost/`  
+   - Archive (e.g. 2004): `http://localhost/site_archive/2004/`
+
+4. **Edit and test**  
+   Changes under `src/` are served immediately; refresh the browser to see them.
+
+## What’s supported
+
+- **HTML/CSS/JS** – Served by Nginx with the existing cache rules.
+- **PHP** – Handled by PHP 7.4-FPM (same as production), including legacy archive pages under `site_archive/`.
+
+The environment matches the production image; if it works here, it should behave the same when deployed.