diff --git a/src/cosmosmesh_privacy_preserving_federated/__init__.py b/src/cosmosmesh_privacy_preserving_federated/__init__.py
index 73806c4..ee8a6f9 100644
--- a/src/cosmosmesh_privacy_preserving_federated/__init__.py
+++ b/src/cosmosmesh_privacy_preserving_federated/__init__.py
@@ -11,3 +11,4 @@ __all__ = [
     "AuditLog",
     "GraphOfContracts",
 ]
+from .canonical_bridge import map_to_ir  # re-export for MVP bridge wiring
diff --git a/src/cosmosmesh_privacy_preserving_federated/canonical_bridge.py b/src/cosmosmesh_privacy_preserving_federated/canonical_bridge.py
new file mode 100644
index 0000000..c0c879d
--- /dev/null
+++ b/src/cosmosmesh_privacy_preserving_federated/canonical_bridge.py
@@ -0,0 +1,4 @@
+# Compatibility shim: re-export map_to_ir from the underscored package path
+from cosmosmesh_privacy_preserving_federated_ import canonical_bridge as _cb
+
+map_to_ir = _cb.map_to_ir
diff --git a/src/cosmosmesh_privacy_preserving_federated_/canonical_bridge.py b/src/cosmosmesh_privacy_preserving_federated_/canonical_bridge.py
new file mode 100644
index 0000000..c86ace8
--- /dev/null
+++ b/src/cosmosmesh_privacy_preserving_federated_/canonical_bridge.py
@@ -0,0 +1,37 @@
+from dataclasses import dataclass
+from typing import Any, Dict, List
+
+
+@dataclass
+class IRPrimitive:
+    name: str
+    payload: Dict[str, Any]
+
+
+@dataclass
+class CanonicalBridgeIR:
+    objects: List[IRPrimitive]
+    morphisms: List[IRPrimitive]
+    plan_delta: IRPrimitive
+    privacy_budget: IRPrimitive
+    audit_log: IRPrimitive
+    version: str = "1.0"
+
+
+def map_to_ir(local_problem: Dict[str, Any]) -> CanonicalBridgeIR:
+    """
+    Lightweight mapper that canonicalizes CosmosMesh primitives to a vendor-agnostic IR.
+    This is intentionally small and focused to bootstrap cross-domain adapters during MVP.
+    """
+    obj = IRPrimitive(name="LocalProblem", payload=local_problem)
+    morph = IRPrimitive(name="SharedVariables", payload={"forecasts": [], "priors": {}, "version": 1})
+    plan = IRPrimitive(name="PlanDelta", payload={"delta": {}, "timestamp": local_problem.get("timestamp")})
+    privacy = IRPrimitive(name="PrivacyBudget", payload={"budget": local_problem.get("privacy_budget", {})})
+    audit = IRPrimitive(name="AuditLog", payload={"entries": []})
+    return CanonicalBridgeIR(
+        objects=[obj],
+        morphisms=[morph],
+        plan_delta=plan,
+        privacy_budget=privacy,
+        audit_log=audit,
+    )