diff --git a/gridresilience_studio/__init__.py b/gridresilience_studio/__init__.py
index 6b1c03e..de9f8b0 100644
--- a/gridresilience_studio/__init__.py
+++ b/gridresilience_studio/__init__.py
@@ -1,42 +1,34 @@
-"""GridResilience Studio core package (minimal bootstrap).
+"""GridResilience Studio public package."""
 
-This repository adds a production-oriented, offline-first cross-domain orchestrator
-foundation. This bootstrap provides a starting point for the EnergiBridge canonical
-interoperability layer and related primitives used across adapters.
+from .bridge import EnergiBridge
+from .core import (
+    AuditLog,
+    DeltaStore,
+    DualVariables,
+    Morphism,
+    Object,
+    PlanDelta,
+    PrivacyBudget,
+    RegistryEntry,
+    build_sample_world,
+)
+from .governance import GovernanceEntry, GovernanceLedger
+from .offline_sync import DeltaSyncEngine
+from .registry import GraphRegistry
 
-Note: This module also patches on import to ensure a consistent API surface across
-environments where the installed distribution might differ from the in-repo sources.
-"""
-
-# Lightweight runtime patch to ensure EnergiBridge API surface is consistent even if
-# an installed distribution lacks the wrappers we rely on during tests.
-try:
-    from . import bridge as _bridge  # type: ignore
-    EnergiBridge = getattr(_bridge, "EnergiBridge", None)
-    if EnergiBridge is not None:
-        # Add missing direct API wrappers if they are not present
-        if not hasattr(EnergiBridge, "map_local_problem"):
-            def _map_local_problem(self, local_problem):
-                return {"type": "Objects", "local_problem": local_problem}
-            EnergiBridge.map_local_problem = _map_local_problem  # type: ignore
-        if not hasattr(EnergiBridge, "map_shared_signals"):
-            def _map_shared_signals(self, shared_signals):
-                return {"type": "Morphisms", "shared_signals": shared_signals}
-            EnergiBridge.map_shared_signals = _map_shared_signals  # type: ignore
-        if not hasattr(EnergiBridge, "map_plan_delta"):
-            def _map_plan_delta(self, plan_delta):
-                return {"type": "PlanDelta", "delta": plan_delta}
-            EnergiBridge.map_plan_delta = _map_plan_delta  # type: ignore
-        if not hasattr(EnergiBridge, "register_adapter"):
-            def _register_adapter(self, adapter_id, contract_version, data_contract):
-                entry = {
-                    "adapter_id": adapter_id,
-                    "contract_version": contract_version,
-                    "data_contract": data_contract,
-                }
-                self._registry[adapter_id] = entry
-                return entry
-            EnergiBridge.register_adapter = _register_adapter  # type: ignore
-except Exception:
-    # Be permissive in patching; if anything goes wrong, tests should still run
-    pass
+__all__ = [
+    "Object",
+    "Morphism",
+    "PlanDelta",
+    "DualVariables",
+    "AuditLog",
+    "PrivacyBudget",
+    "RegistryEntry",
+    "DeltaStore",
+    "build_sample_world",
+    "DeltaSyncEngine",
+    "GraphRegistry",
+    "GovernanceEntry",
+    "GovernanceLedger",
+    "EnergiBridge",
+]
diff --git a/gridresilience_studio/core.py b/gridresilience_studio/core.py
new file mode 100644
index 0000000..0eb91be
--- /dev/null
+++ b/gridresilience_studio/core.py
@@ -0,0 +1,101 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any, Dict, List
+
+
+@dataclass
+class Object:
+    """Canonical object describing a device or asset."""
+
+    id: str
+    type: str
+    properties: Dict[str, Any] = field(default_factory=dict)
+
+    def __post_init__(self) -> None:
+        if not self.id:
+            raise ValueError("Object requires an id")
+
+
+@dataclass
+class Morphism:
+    """Canonical morphism describing a versioned signal edge."""
+
+    id: str
+    source: str
+    target: str
+    signals: Dict[str, Any] = field(default_factory=dict)
+    version: int = 0
+
+    def bump(self) -> None:
+        self.version += 1
+
+
+@dataclass
+class PlanDelta:
+    """Incremental islanding or load-shedding update."""
+
+    delta_id: str
+    islanded: bool = False
+    actions: List[Dict[str, Any]] = field(default_factory=list)
+    tags: Dict[str, str] = field(default_factory=dict)
+
+    def add_action(self, action: Dict[str, Any]) -> None:
+        self.actions.append(action)
+
+
+@dataclass
+class DualVariables:
+    id: str
+    price_vector: List[float] = field(default_factory=list)
+    feasibility: float = 0.0
+    version: int = 0
+
+
+@dataclass
+class AuditLog:
+    entry: str
+    signer: str
+    timestamp: str
+    contract_id: str
+    version: int = 0
+
+
+@dataclass
+class PrivacyBudget:
+    signal: str
+    budget: float
+    remaining: float
+    expiry: str
+
+
+@dataclass
+class RegistryEntry:
+    adapter_id: str
+    contract_version: str
+    data_contract: Dict[str, Any] = field(default_factory=dict)
+
+
+class DeltaStore:
+    def __init__(self) -> None:
+        self.objects: Dict[str, Object] = {}
+        self.morphisms: Dict[str, Morphism] = {}
+        self.deltas: List[PlanDelta] = []
+
+    def add_object(self, obj: Object) -> None:
+        self.objects[obj.id] = obj
+
+    def add_morphism(self, morph: Morphism) -> None:
+        self.morphisms[morph.id] = morph
+
+    def add_delta(self, delta: PlanDelta) -> None:
+        self.deltas.append(delta)
+
+
+def build_sample_world() -> DeltaStore:
+    ds = DeltaStore()
+    ds.add_object(Object(id="DER1", type="DER", properties={"rated_kW": 500, "location": "SiteA"}))
+    ds.add_object(Object(id="LOAD1", type="Load", properties={"critical": True, "rating_kW": 150}))
+    ds.add_morphism(Morphism(id="SIG1", source="DER1", target="LOAD1", signals={"voltage": 1.0}, version=1))
+    ds.add_delta(PlanDelta(delta_id="DELTA1", islanded=True, actions=[{"type": "island", "target": "LOAD1"}], tags={"sig": "v1"}))
+    return ds
diff --git a/gridresilience_studio/governance.py b/gridresilience_studio/governance.py
new file mode 100644
index 0000000..a3bb2c6
--- /dev/null
+++ b/gridresilience_studio/governance.py
@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+import hashlib
+import json
+from dataclasses import dataclass
+from datetime import datetime
+from typing import List
+
+
+@dataclass
+class GovernanceEntry:
+    contract_id: str
+    action: str
+    signer: str
+    timestamp: str
+    version: int
+    payload_hash: str | None = None
+
+
+class GovernanceLedger:
+    def __init__(self) -> None:
+        self._entries: List[GovernanceEntry] = []
+        self._last_hash: str | None = None
+
+    def _hash_entry(self, entry: GovernanceEntry) -> str:
+        data = {
+            "contract_id": entry.contract_id,
+            "action": entry.action,
+            "signer": entry.signer,
+            "timestamp": entry.timestamp,
+            "version": entry.version,
+            "payload_hash": entry.payload_hash,
+            "prev_hash": self._last_hash,
+        }
+        return hashlib.sha256(json.dumps(data, sort_keys=True).encode("utf-8")).hexdigest()
+
+    def append(self, contract_id: str, action: str, signer: str, version: int, payload_hash: str | None = None) -> GovernanceEntry:
+        entry = GovernanceEntry(
+            contract_id=contract_id,
+            action=action,
+            signer=signer,
+            timestamp=datetime.utcnow().isoformat() + "Z",
+            version=version,
+            payload_hash=payload_hash,
+        )
+        self._entries.append(entry)
+        self._last_hash = self._hash_entry(entry)
+        return entry
+
+    def entries(self) -> List[GovernanceEntry]:
+        return list(self._entries)
+
+    def latest_hash(self) -> str | None:
+        return self._last_hash
+
+
+__all__ = ["GovernanceLedger", "GovernanceEntry"]
diff --git a/gridresilience_studio/offline_sync.py b/gridresilience_studio/offline_sync.py
new file mode 100644
index 0000000..3573247
--- /dev/null
+++ b/gridresilience_studio/offline_sync.py
@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+from typing import List, Tuple
+
+from .core import DeltaStore, Morphism, Object, PlanDelta
+
+
+class DeltaSyncEngine:
+    """Lightweight offline-first delta-sync engine."""
+
+    def __init__(self, store: DeltaStore | None = None) -> None:
+        self.store = store or DeltaStore()
+        self.remote_version = 0
+        self.local_version = 0
+
+    def apply_delta(self, delta: PlanDelta) -> None:
+        if any(existing.delta_id == delta.delta_id for existing in self.store.deltas):
+            return
+        self.store.add_delta(delta)
+        self.local_version += 1
+
+    def snapshot(self) -> List[PlanDelta]:
+        return list(self.store.deltas)
+
+    def delta_with_cipher(self, delta: PlanDelta) -> Tuple[PlanDelta, str]:
+        delta.tags["hash"] = f"hash-{delta.delta_id}-{self.local_version}"
+        return delta, delta.tags["hash"]
+
+
+__all__ = ["DeltaSyncEngine", "DeltaStore", "Object", "Morphism", "PlanDelta"]
diff --git a/gridresilience_studio/registry.py b/gridresilience_studio/registry.py
new file mode 100644
index 0000000..86ef0bd
--- /dev/null
+++ b/gridresilience_studio/registry.py
@@ -0,0 +1,29 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any, Dict, Optional
+
+
+@dataclass
+class RegistryEntry:
+    adapter_id: str
+    contract_version: str
+    data_contract: Dict[str, Any] = field(default_factory=dict)
+    metadata: Dict[str, Any] = field(default_factory=dict)
+
+
+class GraphRegistry:
+    def __init__(self) -> None:
+        self._entries: Dict[str, RegistryEntry] = {}
+
+    def add_entry(self, entry: RegistryEntry) -> None:
+        self._entries[entry.adapter_id] = entry
+
+    def get_entry(self, adapter_id: str) -> Optional[RegistryEntry]:
+        return self._entries.get(adapter_id)
+
+    def list_entries(self) -> Dict[str, RegistryEntry]:
+        return dict(self._entries)
+
+
+__all__ = ["GraphRegistry", "RegistryEntry"]