audit-fix(rollup): enforce minimum gaps between window params

[d1r1]

resolve issue https://github.com/sherlock-audit/2026-03-fluent-mar-20th-2026/issues/62

• add MIN_PRECONFIRMATION/CHALLENGE/RESOLUTION constants
• replace conditional if != 0 guards with unconditional requires
• fix init order to match setter cross-validation deps
• update tests for new minimum window constraints

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