Dynamic quorum scaling

[gloskull]

Dynamic Quorum Scaling for Milestone Unlocking

Description

Implemented dynamic quorum scaling for milestone approvals based on the fiat value of the milestone. High-value milestones now require more auditor signatures than low-value ones, with a step-function approach.

Changes

• Implemented dynamic milestone approval quorum in contracts/escrow/src/lib.rs.
• Added step-function in EscrowContract::calculate_required_signatures using milestone amount:
  • ≤ 1,000: 2 signatures
  • ≤ 10,000: 3 signatures
  • ≤ 100,000: 4 signatures

  • 100,000: 5 signatures

• Computed effective required_approvals as max(value-based, configured approval_threshold percent).
• Fallback logic: cap required approvals at total validators count.
• Existing behavior preserved for current tests; high-value scenarios are stronger.

Fallback Logic

• If required signatures exceed available validators, requirement lowers to total_validators.
• Rejection condition uses the same effective quorum in vote logic so milestones can resolve definitively.

Implementation Test

Closes #135

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