require direnv for project tools

ai/backend-context.md

@@ -92,7 +92,8 @@ pattern.
 - Rebuild the development database with:
 
   ```sh
-  php artisan migrate:fresh --seed
+  direnv exec "$(git rev-parse --show-toplevel)" \
+    php artisan migrate:fresh --seed
   ```
 
 - Once a production database exists, replace this policy with additive,
@@ -101,7 +102,12 @@ pattern.
 ## Before completing backend work
 
 - Run the focused test during development.
-- Run `php artisan test` before completion.
+- Run the full test suite before completion:
+
+  ```sh
+  direnv exec "$(git rev-parse --show-toplevel)" php artisan test
+  ```
+
 - Run the Composer static-analysis scripts.
 - Fix failures caused by the change. Report unrelated baseline failures
   precisely rather than hiding them or expanding scope without authorization.