Function normalizedCIAContext

Normalize CIAContext so defectionProbability is in [0, 1].

risk-analysis.ts multiplies it by 100, so out-of-range values can explode scores. Expected input formats:

• (0, 1] — already a proper probability fraction; kept as-is. Note: exactly 1.0 is treated as 100% (not as 1% whole-percent).
• (1, ∞) — treated as a whole-percent (loadCIAContext returns min 5, e.g. 50 means 50% → normalized to 0.5); clamped to 1.
• Non-finite or ≤ 0 — coerced to 0 (no defection risk).