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docs/conventions.md

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+# Conventions (Short)
+
+## CSS
+- All project files use `app-` prefix.
+- Vendor overrides use `vendor-` prefix.
+- Structure: `base/`, `layout/`, `components/`, `pages/`.
+
+## JS
+- All project files use `app-` prefix.
+- Vendor scripts stay in `web/vendor`.
+- Structure: `core/`, `components/`, `pages/`.
+
+## Partials
+- All partials use `app-` prefix (e.g. `app-footer.phtml`).
+
+## PHP (Lib)
+- Services in `lib/Service`, repositories in `lib/Repository`.