Replace the single-file v1.3.1 script with a proper src/bnet_auth_tool/
package: config (YAML settings + platformdirs), crypto (scrypt + AES-256-GCM
with a versioned header; legacy PBKDF2 100k/600k still decrypt), storage
(single encrypted vault), fileio (atomic 0600 writes), api, totp, migrate, and
a cli with an interactive menu plus argparse subcommands.
Security/audit fixes: drop catch-all excepts, stop leaking server bodies/tokens
in errors, atomic permission-hardened writes, explicit Ctrl-C handling,
versioned format header, best-effort passphrase scrubbing.
Add packaging (pyproject for uv, organized requirements.txt fallback, uv.lock),
.gitignore, settings.yaml, CLAUDE.md/AGENTS.md, 22 pytest tests, and ruff
config. Online attach/retrieve is preserved but kept labelled unverified.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
