Add black formatting rule to dev skill (microsoft#103)

Ensures Claude Code runs black before committing, matching CI requirements.

Co-authored-by: tpellissier <tpellissier@microsoft.com>

Author: tpellissier-msft

.claude/skills/dataverse-sdk-dev/SKILL.md

@@ -25,4 +25,5 @@ This skill provides guidance for developers working on the PowerPlatform Dataver
 7. **Standardize output format** - Use `[INFO]`, `[WARN]`, `[ERR]`, `[OK]` prefixes for console output
 8. **No noqa comments** - Do not add `# noqa: BLE001` or similar linter suppression comments
 9. **Document public APIs** - Add Sphinx-style docstrings with examples for public methods
-10. **Define __all__ in module files, not __init__.py** - Use `__all__` to control exports in the actual module file (e.g., errors.py), not in `__init__.py`.
+10. **Define __all__ in module files, not __init__.py** - Use `__all__` to control exports in the actual module file (e.g., errors.py), not in `__init__.py`.
+11. **Run black before committing** - Always run `python -m black <changed files>` before committing. CI will reject unformatted code. Config is in `pyproject.toml` under `[tool.black]`.

src/PowerPlatform/Dataverse/claude_skill/dataverse-sdk-dev/SKILL.md

@@ -25,4 +25,5 @@ This skill provides guidance for developers working on the PowerPlatform Dataver
 7. **Standardize output format** - Use `[INFO]`, `[WARN]`, `[ERR]`, `[OK]` prefixes for console output
 8. **No noqa comments** - Do not add `# noqa: BLE001` or similar linter suppression comments
 9. **Document public APIs** - Add Sphinx-style docstrings with examples for public methods
-10. **Define __all__ in module files, not __init__.py** - Use `__all__` to control exports in the actual module file (e.g., errors.py), not in `__init__.py`.
+10. **Define __all__ in module files, not __init__.py** - Use `__all__` to control exports in the actual module file (e.g., errors.py), not in `__init__.py`.
+11. **Run black before committing** - Always run `python -m black <changed files>` before committing. CI will reject unformatted code. Config is in `pyproject.toml` under `[tool.black]`.