Improved Debug Output

This release improves the debugging experience by making the --debug flag automatically enable verbose output, so you see all test results when diagnosing failures.

🔧 Changes

Debug mode implies verbose output

The --debug flag (or TENZIR_TEST_DEBUG=1 environment variable) now automatically enables verbose output. When debugging test failures, you now see all test results (pass/skip/fail) instead of only failures, making it easier to diagnose issues. This provides more context without requiring users to pass both --debug and --verbose flags separately.

By @mavam and @claude in #9.