Mutation testing on `CollateralManager` and `wallet_auth`

[YaronZaki]

• Difficulty: advanced · Effort: L · Priority: P2
• Impact: protocol math, auth invariants
• Problem Statement
  Coverage tests tests/test_collateral_manager_props.py prove the
  tests ran but not that they caught a bug. Mutation testing
  introduces deliberate bugs and measures how many the test suite
  catches (mutation score).
• Why It Matters
  A calculate_health_ratio mutation that swaps <= with < will
  pass a coverage test but kill a liquidatable user. A signature
  mutation that skips nonce expiry will pass coverage tests and
  open replay attacks.
• Expected Outcome
  mutmut or cosmic-ray runs in a separate CI matrix on a curated
  subset of files: quantara/soroban/adapters/CollateralManager.py and
  quantara/web_app/api/wallet_auth.py. Mutation score > 80% enforced.
• Acceptance Criteria
  • Mutation score report in tests/mutation/<date>.html.
  • New mutants introduced by hand (operator swaps <= for <,
    == for is) are caught by the existing test suite.
• Implementation Notes

  mutmut run --paths-to-mutate quantara/soroban/adapters/CollateralManager.py
  mutmut html

• Files / Modules Affected
  • quantara/soroban/adapters/CollateralManager.py
  • quantara/web_app/api/wallet_auth.py
  • new .github/workflows/mutation.yml
• Dependencies: standalone; pairs with #69 (property-based).

[Dickson2015]

The issue description is crystal clear, Maintainer I would love to be given the opportunity to work on issue

[A-one-tech]

Focused on building trust through consistent, meaningful contributions. I approach every issue with curiosity, attention to detail, and a commitment to delivering clean, maintainable, and well-tested solutions. Driven by impact, not just commits, I value clear communication, effective collaboration with maintainers, continuous learning, and delivering meaningful value to every project I contribute to.

[theFirstCodeManiac]

Hi, maintainer. I'd love to work on this issue because I have the required experience. I'd be thrilled if it were assigned to me. Thank you.

[grantfox-oss]

🦊 GrantFox — @Dickson2015 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #294)
2. Your PR will be reviewed by the Quantarq maintainers

Good luck! Track your progress on GrantFox.