docs: Document test:dev usage and remove default output suppression

- Remove --output-logs=errors-only from default test:dev script
- Add 'Running tests' section to README documenting test commands
- Document how to suppress output with --output-logs=errors-only flag

Co-Authored-By: Claude <[email protected]>

Author: rekmarks

README.md

@@ -55,6 +55,18 @@ collection, but it does not disable lockdown in all packages. `development` mode
 tests don't have to pass, and are not run in CI; they are for local debugging
 purposes only.
 
+### Running tests
+
+- `yarn test` - Run all tests with coverage (uses root vitest config)
+- `yarn test:dev` - Run tests via Turborepo with caching (faster for repeated runs)
+- `yarn test:dev --filter=@ocap/kernel` - Run tests for a specific package
+
+To show only errors (suppress successful test output):
+
+```bash
+yarn test:dev --output-logs=errors-only
+```
+
 ### Adding new packages
 
 See [`packages/create-package/README.md`](packages/create-package/README.md).

package.json

@@ -31,7 +31,7 @@
     "rebuild:native": "./scripts/rebuild-native.sh",
     "test": "yarn pretest && vitest run",
     "test:ci": "vitest run --coverage false",
-    "test:dev": "turbo run test:dev --output-logs=errors-only",
+    "test:dev": "turbo run test:dev",
     "test:e2e": "yarn workspaces foreach --all run test:e2e",
     "test:e2e:ci": "yarn workspaces foreach --all run test:e2e:ci",
     "test:e2e:local": "yarn workspaces foreach --all run test:e2e:local",