fix: apply black formatting to all Python files

Resolves the black --format check CI failure. Changes applied across
app/app.py and all four attacks/ scripts:

- Normalize all string literals to double quotes (black default)
- Collapse logging.basicConfig() inner args onto one line where they fit
- Collapse short function signatures and call sites within 100-char limit
- Add magic trailing commas to multi-line structures that stay expanded
- Expand json.dump() calls that exceed 100 chars onto multiple lines
- Convert open(..., 'w') mode string to double quotes
- Fix implicit f-string concatenation alignment in logger.info calls
- Fix help= argument indentation in argparse.add_argument()
- Collapse run_targeted_account_attack() signature (fits in 100 chars)
- Collapse run_escalating_exhaustion() call site (fits in 100 chars)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: codewithbrandon