Fix: wire up --verbose flag to gate PASS output in validate.py

[jcarr710]

The --verbose flag was defined in argparse but never passed through
to validate_directory or validate_files_in_directory, so it had
no effect regardless of whether it was passed or not.

This fix wires verbose through the call chain so that PASS output
is only shown when --verbose is passed. Default behavior now shows
only failures and the summary, which is more useful when validating
500+ files.

Before: python scripts/validate.py always printed all PASS lines
After: python scripts/validate.py shows summary only
python scripts/validate.py --verbose shows all PASS lines

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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