v1.5.3 — Fix: ExplicitTrusted pipeline (policy hints now work)

Bug Fix: explicit causal links → policy hints

When users called link_records(cause_id, effect_id, "causal"), the SDK
accepted the links but never produced policy hints. Fixed.

What was broken

CausalEvidenceMode::ExplicitTrusted was added in 1.5.2 but the causal
and policy pipeline still applied strict repeated-window criteria,
silently rejecting all user-declared causal links.

What was fixed

• Causal evidence gates now respect explicit trust signals
• Policy seed selection accepts explicit-backed patterns
• Confidence scoring falls back to record level when beliefs are not yet formed
• Causal and policy engines now persist correctly between sessions

Result

After 2+ explicit causal links, the cognitive stack surfaces actionable
policy hints — avoid, warn, verify_first — that strengthen over time
as more evidence accumulates.

Upgrade

pip install aura-memory==1.5.3