v2.8.1: docs(skills): update qa-tester skill to use html3 test project

2.8.1

Bug Fixes

• -c config shortcut removed: The -c shortcut for --config never worked due to invalid Symfony Console syntax. The broken shortcut has been removed; use --config=path instead.
• Phpcbf re-stage in hooks: Files auto-fixed by phpcbf during a pre-commit hook are now re-staged so the fixes are included in the commit.