Adds types

docs/DEVELOPMENT_GUIDE.md

@@ -95,6 +95,28 @@ task lint:fix
 task security
 ```
 
+### Type Checking with Sorbet
+
+TurboVault uses Sorbet for gradual static type checking.
+
+```bash
+# First time setup (after bundle install)
+task tapioca:init
+task tapioca:all
+
+# Run type checker
+task typecheck
+
+# Watch mode (re-checks on file changes)
+task typecheck:watch
+
+# Update type definitions after gem/model changes
+task tapioca:gems  # After bundle install
+task tapioca:dsl   # After model changes
+```
+
+**See [SORBET.md](SORBET.md) for complete type checking guide.**
+
 ## Project Structure
 
 ```