implement sigmoid function precision#265
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Refines the Sybil scoring module to resolve floating-point precision issues identified during the audit.
🧠 Problem Context & Fix
The Issue: Traditional floating-point math introduced precision drift and non-deterministic behavior in the sigmoid function calculation.
The Fix: Migrated the calculations to fixed-point math to guarantee precise, deterministic scoring across all environments.
🛠️ Technical Scope & Changes
Core Logic: Replaced standard division/exponential logic with a fixed-point math implementation for the sigmoid function.
Testing: Added targeted unit tests to validate precision bounds and ensure compliance with protocol invariants.
✅ Checklist
[x] Sigmoid precision fixed using fixed-point math.
[x] Unit tests executed and passed.
[x] Protocol invariants verified; zero regressions.
Closes #220