FixedMathSharp-Unity v3.0.0

This release updates the project to FixedMathSharp v3.0.0.
While the dependency is mostly internal, FixedMathSharp numerics are part of our public API surface, so this is released as a breaking update.

• Breaking
  • Upgraded to FixedMathSharp v3.0.0.
  • FixedMathSharp removed/renamed precision-related members and tightened deterministic numeric APIs (including float-overload removals), which may require consumer code changes.
  • Tolerance/epsilon behavior in numeric comparisons may differ from previous versions.
• What This Means For Consumers
  • Rebuild and run tests against this release before promotion.
  • Update any call sites relying on removed float-based numeric overloads.
  • Replace Precision-style usage with the new MinIncrement/updated tolerance semantics where applicable.
  • Re-validate tolerance-sensitive logic (movement thresholds, comparisons, convergence checks, serialization expectations).