document standalone vue workflow

Update the AI guidance for the scaffolded npm application, its actual validation scripts, and its independent runtime boundary. Record the current lack of frontend test tooling without inventing commands.

ai/shared.md

@@ -13,8 +13,10 @@ these rules.
   unfinished assignments across the remaining dates.
 - Planned features in `README.md` are future ideas, not authorized scope.
 - The Laravel backend exists under `backend/`.
-- The Vue frontend has not been scaffolded yet. Do not create it unless the
-  user explicitly asks for that work.
+- The standalone Vue frontend exists under `frontend/website/`.
+- Keep the frontend independent from the backend. Do not add backend-driven
+  rendering, asset delivery, or build integration unless the user explicitly
+  asks for it.
 - PostgreSQL is the development and runtime database.
 - PHPUnit uses in-memory SQLite for isolated tests.
 
@@ -62,6 +64,9 @@ those changes with the most relevant parser, formatter, dry run, or check.
 
 - Run backend commands from `backend/`, or explicitly change into it in the
   command.
+- Run frontend commands from `frontend/website/`.
+- `process-compose` does not start the frontend. Start it separately with
+  `npm run dev -- --port "$VITE_PORT"` when needed.
 - When a normally valid check fails because a required service is down,
   surface the environmental failure. Do not skip the check or silently switch
   to a different database or service.
@@ -134,9 +139,12 @@ those changes with the most relevant parser, formatter, dry run, or check.
   direnv exec <worktree> true
   ```
 
-- Never symlink `backend/vendor` or a future frontend's `node_modules` from
-  another checkout. Dependency paths and generated autoloaders must remain
+- Never symlink `backend/vendor` or `frontend/website/node_modules` from
+  another checkout. Dependency paths and generated files must remain
   worktree-local.
+- The shell hook installs backend dependencies but does not install frontend
+  dependencies. Run `npm install` from `frontend/website/` when provisioning a
+  fresh worktree.
 
 Do not push anything. Make commits as the TDD workflow requires.
 
@@ -162,11 +170,19 @@ gate affected by the change.
 
 ### Frontend
 
-- The frontend does not exist yet. Once scaffolded, use the scripts defined in
-  its `package.json` for formatting, linting, type checking, unit tests, and
-  end-to-end tests.
-- Update `ai/frontend-context.md` when the actual scaffold, package manager,
-  and commands are known.
+- Run these commands from `frontend/website/`:
+
+  ```sh
+  npm run format
+  npm run lint
+  npm run type-check
+  npm run build
+  ```
+
+- The formatter and linters rewrite files. Review their changes before
+  committing.
+- No frontend test runner is configured yet. Do not claim unit, component, or
+  end-to-end test coverage until the relevant scripts exist and pass.
 
 ### Environment and integration