feat(integrations): add opt-in AURA trust adapter (#2026)

Adds a read-only opt-in AURA trust-check adapter. Synthetic merge passed validators and 22 AURA offline tests via uvx pytest.

integrations/aura/__init__.py

@@ -0,0 +1,36 @@
+"""
+AURA trust-check adapter — opt-in, read-only counterparty reputation.
+
+    from aura import before_settle, AuraUntrusted
+
+    try:
+        before_settle(counterparty_did)
+        settle_payment(counterparty_did, amount)
+    except AuraUntrusted as e:
+        abort(str(e))
+
+Zero dependencies (pure stdlib). Does not sign, hold keys, or move funds.
+See README.md for the enable section and THREAT_MODEL.md for the boundary.
+"""
+
+from .adapter import (
+    DEFAULT_ALLOW,
+    DEFAULT_BASE_URL,
+    AuraUntrusted,
+    AuraVerdict,
+    aura_verdict,
+    before_settle,
+    require_trust,
+)
+
+__all__ = [
+    "aura_verdict",
+    "before_settle",
+    "require_trust",
+    "AuraVerdict",
+    "AuraUntrusted",
+    "DEFAULT_BASE_URL",
+    "DEFAULT_ALLOW",
+]
+
+__version__ = "0.1.0"