Update README.md (#240)

It now recommends that users use `uv` and `scrapscript_tests.py` for
testing.

Author: neuroevolutus

README.md

@@ -77,8 +77,32 @@ LDFLAGS=-lwasi-emulated-mman \
 ./scrapscript.py compile some.scrap --compile  # produces a.out
 ```
 
-## Running Tests
+## Development Workflow
+
+### Running Tests
+
+```bash
+python scrapscript_tests.py
+```
+
+### Type Checking the Python Sources
+```bash
+mypy --strict scrapscript.py
+```
+
+### Formatting the Python Sources
+```bash
+ruff format scrapscript.py
+```
+
+### Checking for Format Errors
+```bash
+ruff check scrapscript.py
+```
+
+### Using `uv`
+If you choose to use `uv` to manage development dependencies, you can run any of the previous four commands by prefixing them with `uv run`, e.g.:
 
 ```bash
-python3 scrapscript.py test
+uv run python scrapscript_tests.py
 ```