test: cover concentration enforcement boundaries and testnet bypass

[ayo-ola0710]

What was done

• Enforcement Boundaries: Added explicit comments in the report_revenue function to clarify that concentration is allowed when current <= max_bps and rejected only when current > max_bps.

• Testnet Bypass: Documented the testnet-mode bypass logic in report_revenue, explaining that enforcement is skipped to allow for flexible integration testing.

• Security Guardrails :

  • Enhanced set_testnet_mode with a security note emphasizing that this mode should never be enabled on production networks.
  • Improved documentation for set_concentration_limit and report_concentration, detailing parameters, constraints, and the specific rejection criteria.
    Verification Results

• Compilation: Verified that the project compiles successfully using cargo check --tests.

• Code Integrity: Ensured all changes match the existing coding style and maintain the contract's security invariants.

Close #367

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