build(agent): semicolon#54de0b iteration

README.md

@@ -2,25 +2,27 @@ OpenEnergySphere EnergiBridge MVP
 
 Overview
 - EnergiBridge provides a canonical, vendor-agnostic interoperability layer for cross-domain energy planning. It translates domain primitives into a compact IR (Object, SharedVariables, PlanDelta) and enables plug-and-play adapters across DERs, meters, pumps, and buildings while preserving offline-first operation and governance hooks.
+- The current codebase includes a signed governance ledger, deterministic delta-sync, a contract template registry, a lightweight marketplace listing flow, and optional SQLite persistence for the registry.
 
 Architecture
-- Core primitives: LocalProblem (per-site optimization), SharedVariables (signals and priors), PlanDelta (incremental actions with provenance), and a Graph-of-Contracts (GoC) registry for adapters and data schemas.
+- Core primitives: LocalProblem (per-site optimization), SharedVariables (signals and priors), PlanDelta (incremental actions with provenance), DeltaEnvelope (offline sync packaging), and a Graph-of-Contracts registry for adapters, templates, and data schemas.
+- Governance: GovernanceLedger produces chained, HMAC-signed audit entries for approvals and policy changes.
 - EnergiBridgeMapper (in src/energysphere/energi_bridge.py) maps Energysphere primitives to a canonical IR representation and supports round-tripping LocalProblem objects.
-- Registry: In-memory GraphContractRegistry with metadata for auditing and replay protection. LocalProblems get stored with version, timestamp, and nonce metadata.
-- Adapters: Starter adapters implemented under energysphere/adapters/ (SubstationMeterAdapter, DERAggregatorAdapter).
-- Server API: Lightweight FastAPI app in energysphere/server/main.py exposing contract and adapter endpoints.
+- Registry: GraphContractRegistry supports in-memory operation and optional SQLite-backed persistence. LocalProblems get stored with version, timestamp, and nonce metadata.
+- Adapters: Starter adapters implemented under energysphere/adapters/ (SubstationMeterAdapter, DERAggregatorAdapter) and marketplace capability publishing.
+- Server API: FastAPI app in energysphere/server/main.py exposing contract, template, delta-sync, and governance endpoints.
 
-Roadmap (MVP, 8–12 weeks)
-- Phase 0: Protocol skeleton, 2 starter adapters, TLS transport, ADMM-lite local solver, delta-sync with deterministic replay.
+Roadmap
+- Phase 0: Protocol skeleton, 2 starter adapters, TLS transport, delta-sync with deterministic replay.
 - Phase 1: Governance ledger scaffold, identity management (DIDs/certs), secure aggregation for SharedVariables.
 - Phase 2: Cross-domain demo with toy cross-domain objective and EnergiBridge SDK.
 - Phase 3: Hardware-in-the-loop validation and KPI dashboards.
 
 Data Contracts Seeds
-- LocalProblem, SharedVariables, DualVariables, PlanDelta, PrivacyBudget, AuditLog; a Graph-of-Contracts registry; minimal contract example and conformance harness for adapters.
+- LocalProblem, SharedVariables, DualVariables, PlanDelta, DeltaEnvelope, ContractTemplate, GovernanceEvent, PrivacyBudget, AuditLog; a Graph-of-Contracts registry; minimal contract example and conformance harness for adapters.
 
 Security & Governance
-- Hardware-backed attestation for adapters; DID/short-lived certs; attestation for plan deltas; optional local DP budgets.
+- Hardware-backed attestation for adapters; DID/short-lived certs; attestation for plan deltas; optional local DP budgets; append-only governance audit chain.
 
 How to run (current MVP)
 - Install dependencies and run tests:
@@ -31,3 +33,4 @@ How to run (current MVP)
 Notes
 - This project uses a pyproject.toml with a proper build-system. Packaging metadata is wired to README.md via readme = "README.md" in pyproject.toml.
 - The goal is to keep a tight MVP surface while enabling gradual expansion into a production-grade, privacy-preserving federation platform.
+- Optional SQLite persistence can be enabled by constructing `GraphContractRegistry(db_path=...)`.

pyproject.toml

@@ -11,6 +11,7 @@ requires-python = ">=3.10"
 
 dependencies = [
   "fastapi>=0.90.0",
+  "httpx>=0.23.0",
   "uvicorn[standard]>=0.18.0",
   "pydantic>=1.10.2",
   "pytest>=7.0.0"
@@ -18,4 +19,3 @@ dependencies = [
 
 [tool.setuptools]
 package-dir = { "" = "src" }
-

src/energysphere/__init__.py

@@ -1,9 +1,38 @@
-""" Energysphere core package minimal init. """
+"""EnergiBridge core package."""
 __version__ = "0.1.0"
 
-# Re-export common bridge utilities for quick access
-try:
-    from .energi_bridge import EnergiBridgeMapper  # type: ignore
-except Exception:
-    # If optional or during early import stages, fail gracefully.
-    EnergiBridgeMapper = None  # type: ignore
+from .energi_bridge import EnergiBridgeMapper
+from .governance import GovernanceLedger
+from .models import (
+    AdapterConformance,
+    AuditLog,
+    ContractTemplate,
+    DeltaEnvelope,
+    DualVariables,
+    GovernanceEvent,
+    LocalProblem,
+    PlanDelta,
+    PrivacyBudget,
+    SharedVariable,
+    SharedVariables,
+)
+from .registry import GraphContractRegistry
+from .sync import DeltaSyncEngine
+
+__all__ = [
+    "AdapterConformance",
+    "AuditLog",
+    "ContractTemplate",
+    "DeltaEnvelope",
+    "DeltaSyncEngine",
+    "DualVariables",
+    "EnergiBridgeMapper",
+    "GovernanceEvent",
+    "GovernanceLedger",
+    "GraphContractRegistry",
+    "LocalProblem",
+    "PlanDelta",
+    "PrivacyBudget",
+    "SharedVariable",
+    "SharedVariables",
+]

src/energysphere/adapters/der_aggregator.py

@@ -9,12 +9,24 @@ class DERAggregatorAdapter:
 
     def __init__(self, registry: GraphContractRegistry) -> None:
         self._registry = registry
+        self.supported_domains = ["electricity", "distributed-energy-resources"]
 
     def collect_local_problem(self) -> LocalProblem:
         lp = LocalProblem(
             site_id="site-der-agg-001",
             objective="min-carbon",
             parameters={"der_count": 5, "time_horizon": 24},
+            domain="electricity",
         )
         self._registry.register_local_problem("contract-der-aggregator-001", lp)
         return lp
+
+    def publish_capability(self) -> dict[str, object]:
+        listing = {
+            "adapter_id": self.adapter_id,
+            "name": "DER Aggregator Adapter",
+            "domains": self.supported_domains,
+            "contracts": ["contract-der-aggregator-001"],
+        }
+        self._registry.register_marketplace_entry(self.adapter_id, listing)
+        return listing

src/energysphere/adapters/substation_meter.py

@@ -1,10 +1,7 @@
 from __future__ import annotations
 
-from typing import Any, Dict
-
 from energysphere.models import LocalProblem
 from energysphere.registry import GraphContractRegistry
-from energysphere.models import LocalProblem
 
 
 class SubstationMeterAdapter:
@@ -14,6 +11,7 @@ class SubstationMeterAdapter:
 
     def __init__(self, registry: GraphContractRegistry) -> None:
         self._registry = registry
+        self.supported_domains = ["electricity"]
 
     def collect_local_problem(self) -> LocalProblem:
         # Minimal sample LocalProblem; in a real system this would read from meters.
@@ -21,7 +19,18 @@ class SubstationMeterAdapter:
             site_id="site-meter-001",
             objective="min-cost",
             parameters={"load": 1.0, "time_horizon": 24},
+            domain="electricity",
         )
         # register a reference contract for this adapter's generated problem
         self._registry.register_local_problem("contract-substation-meter-001", lp)
         return lp
+
+    def publish_capability(self) -> dict[str, object]:
+        listing = {
+            "adapter_id": self.adapter_id,
+            "name": "Substation Meter Adapter",
+            "domains": self.supported_domains,
+            "contracts": ["contract-substation-meter-001"],
+        }
+        self._registry.register_marketplace_entry(self.adapter_id, listing)
+        return listing

src/energysphere/compat.py

@@ -0,0 +1,9 @@
+from __future__ import annotations
+
+from typing import Any
+
+
+def model_to_dict(model: Any) -> dict[str, Any]:
+    if hasattr(model, "model_dump"):
+        return model.model_dump()
+    return model.dict()

src/energysphere/energi_bridge.py

@@ -60,6 +60,7 @@ class EnergiBridgeMapper:
             "value": getattr(sv, "value", None),
             "version": getattr(sv, "version", 1),
             "privacy_bound": getattr(sv, "privacy_bound", None),
+            "source_contract_id": getattr(sv, "source_contract_id", None),
         }
 
     def map_plan_delta(self, delta: Any) -> Dict[str, Any]:  # be resilient to different shapes
@@ -67,10 +68,14 @@ class EnergiBridgeMapper:
         return {
             "type": "PlanDelta",
             "delta_id": getattr(delta, "delta_id", ""),
+            "contract_id": getattr(delta, "contract_id", None),
             "changes": getattr(delta, "changes", {}),
             "timestamp": getattr(delta, "timestamp", 0.0),
             # Prefer an explicit author field if present; otherwise fall back to delta_id
             "author": getattr(delta, "author", getattr(delta, "delta_id", "")),
+            "provenance": getattr(delta, "provenance", {}),
+            "privacy_budget": getattr(delta, "privacy_budget", None),
+            "signature": getattr(delta, "signature", None),
         }
 
 

src/energysphere/governance.py

@@ -0,0 +1,101 @@
+from __future__ import annotations
+
+import hashlib
+import hmac
+import json
+import secrets
+import time
+from typing import Any, Dict, List, Optional
+
+from pydantic import BaseModel, Field
+
+
+class LedgerEntry(BaseModel):
+    event_id: str
+    event_type: str
+    actor: str
+    timestamp: float
+    payload: Dict[str, Any] = Field(default_factory=dict)
+    previous_hash: Optional[str] = None
+    entry_hash: str
+    signature: str
+
+
+class GovernanceLedger:
+    """Append-only governance ledger with chained hashes and HMAC signatures."""
+
+    def __init__(self, signing_secret: str | None = None) -> None:
+        self._signing_secret = signing_secret or secrets.token_hex(32)
+        self._entries: List[LedgerEntry] = []
+
+    @property
+    def signing_secret(self) -> str:
+        return self._signing_secret
+
+    def append_event(
+        self,
+        event_type: str,
+        actor: str,
+        payload: Dict[str, Any] | None = None,
+        *,
+        timestamp: float | None = None,
+        event_id: str | None = None,
+    ) -> LedgerEntry:
+        payload = payload or {}
+        timestamp = time.time() if timestamp is None else timestamp
+        event_id = event_id or secrets.token_hex(12)
+        previous_hash = self._entries[-1].entry_hash if self._entries else None
+        canonical = {
+            "event_id": event_id,
+            "event_type": event_type,
+            "actor": actor,
+            "timestamp": timestamp,
+            "payload": payload,
+            "previous_hash": previous_hash,
+        }
+        entry_hash = self._hash(canonical)
+        signature = self._sign(entry_hash)
+        entry = LedgerEntry(
+            event_id=event_id,
+            event_type=event_type,
+            actor=actor,
+            timestamp=timestamp,
+            payload=payload,
+            previous_hash=previous_hash,
+            entry_hash=entry_hash,
+            signature=signature,
+        )
+        self._entries.append(entry)
+        return entry
+
+    def list_entries(self) -> List[LedgerEntry]:
+        return list(self._entries)
+
+    def verify_chain(self) -> bool:
+        previous_hash = None
+        for entry in self._entries:
+            canonical = {
+                "event_id": entry.event_id,
+                "event_type": entry.event_type,
+                "actor": entry.actor,
+                "timestamp": entry.timestamp,
+                "payload": entry.payload,
+                "previous_hash": previous_hash,
+            }
+            expected_hash = self._hash(canonical)
+            if expected_hash != entry.entry_hash:
+                return False
+            if self._sign(expected_hash) != entry.signature:
+                return False
+            previous_hash = entry.entry_hash
+        return True
+
+    def _hash(self, payload: Dict[str, Any]) -> str:
+        blob = json.dumps(payload, sort_keys=True, separators=(",", ":")).encode("utf-8")
+        return hashlib.sha256(blob).hexdigest()
+
+    def _sign(self, entry_hash: str) -> str:
+        return hmac.new(self._signing_secret.encode("utf-8"), entry_hash.encode("utf-8"), hashlib.sha256).hexdigest()
+
+
+__all__ = ["GovernanceLedger", "LedgerEntry"]

src/energysphere/models.py

@@ -1,13 +1,16 @@
 from __future__ import annotations
 
-from typing import Any, Dict, Optional
-from pydantic import BaseModel
+from typing import Any, Dict, List, Optional
+
+from pydantic import BaseModel, Field
 
 
 class LocalProblem(BaseModel):
     site_id: str
     objective: str
     parameters: Dict[str, Any]
+    domain: str = "electricity"
+    contract_id: Optional[str] = None
 
 
 class SharedVariables(BaseModel):
@@ -15,22 +18,41 @@ class SharedVariables(BaseModel):
     value: Any
     version: int
     privacy_bound: Optional[float] = None
+    source_contract_id: Optional[str] = None
+
+
+SharedVariable = SharedVariables
 
 
 class DualVariables(BaseModel):
     primal: float
     dual: float
+    step: Optional[int] = None
 
 
 class PlanDelta(BaseModel):
     delta_id: str
+    contract_id: Optional[str] = None
     changes: Dict[str, Any]
     timestamp: float
+    author: Optional[str] = None
+    provenance: Dict[str, Any] = Field(default_factory=dict)
+    privacy_budget: Optional[float] = None
+    signature: Optional[str] = None
+
+
+class DeltaEnvelope(BaseModel):
+    replica_id: str
+    sequence: int
+    plan_delta: PlanDelta
+    previous_hash: Optional[str] = None
+    entry_hash: Optional[str] = None
 
 
 class PrivacyBudget(BaseModel):
     budget: float
     used: float
+    scope: Optional[str] = None
 
 
 class AuditLog(BaseModel):
@@ -38,3 +60,32 @@ class AuditLog(BaseModel):
     action: str
     timestamp: float
     actor: str
+    result: Optional[str] = None
+    metadata: Dict[str, Any] = Field(default_factory=dict)
+
+
+class ContractTemplate(BaseModel):
+    template_id: str
+    name: str
+    domain: str
+    schema_version: int = 1
+    description: Optional[str] = None
+    fields: Dict[str, str] = Field(default_factory=dict)
+
+
+class GovernanceEvent(BaseModel):
+    event_id: str
+    event_type: str
+    actor: str
+    timestamp: float
+    payload: Dict[str, Any] = Field(default_factory=dict)
+    previous_hash: Optional[str] = None
+    entry_hash: Optional[str] = None
+    signature: Optional[str] = None
+
+
+class AdapterConformance(BaseModel):
+    adapter_id: str
+    contract_id: str
+    status: str
+    notes: List[str] = Field(default_factory=list)

src/energysphere/registry.py

@@ -1,10 +1,14 @@
 from __future__ import annotations
 
+import json
+import sqlite3
 import time
 import secrets
+from pathlib import Path
 from typing import Any, Dict, List
 
-from .models import LocalProblem
+from .compat import model_to_dict
+from .models import AdapterConformance, ContractTemplate, LocalProblem, PlanDelta
 
 
 class GraphContractRegistry:
@@ -14,8 +18,16 @@ class GraphContractRegistry:
     a persistent registry backed by SQLite/PostgreSQL in the future.
     """
 
-    def __init__(self) -> None:
+    def __init__(self, db_path: str | None = None) -> None:
         self._contracts: Dict[str, Dict[str, Any]] = {}
+        self._templates: Dict[str, Dict[str, Any]] = {}
+        self._deltas: Dict[str, Dict[str, Any]] = {}
+        self._marketplace: Dict[str, Dict[str, Any]] = {}
+        self._db_path = Path(db_path) if db_path else None
+        self._conn = sqlite3.connect(self._db_path) if self._db_path else None
+        if self._conn is not None:
+            self._conn.row_factory = sqlite3.Row
+            self._init_db()
 
     def register_contract(self, contract_id: str, contract_spec: Dict[str, Any]) -> None:
         """Register a contract specification with optional metadata.
@@ -25,6 +37,7 @@ class GraphContractRegistry:
         contract_spec as-is for backward-compatibility.
         """
         self._contracts[contract_id] = contract_spec
+        self._persist("contracts", contract_id, contract_spec)
 
     def register_contract_with_meta(
         self,
@@ -49,6 +62,7 @@ class GraphContractRegistry:
         contract_spec = dict(contract_spec)  # shallow copy
         contract_spec["_meta"] = meta
         self._contracts[contract_id] = contract_spec
+        self._persist("contracts", contract_id, contract_spec)
 
     def list_contracts(self) -> List[Dict[str, Any]]:
         return list(self._contracts.values())
@@ -56,13 +70,71 @@ class GraphContractRegistry:
     def get_contract(self, contract_id: str) -> Dict[str, Any] | None:
         return self._contracts.get(contract_id)
 
+    def register_contract_template(self, template_id: str, template: ContractTemplate | Dict[str, Any]) -> None:
+        template_dict = model_to_dict(template) if isinstance(template, ContractTemplate) else dict(template)
+        self._templates[template_id] = template_dict
+        self._persist("templates", template_id, template_dict)
+
+    def list_contract_templates(self) -> List[Dict[str, Any]]:
+        return list(self._templates.values())
+
+    def register_plan_delta(self, delta: PlanDelta) -> None:
+        delta_dict = model_to_dict(delta)
+        self._deltas[delta.delta_id] = delta_dict
+        self._persist("deltas", delta.delta_id, delta_dict)
+
+    def list_plan_deltas(self) -> List[Dict[str, Any]]:
+        return list(self._deltas.values())
+
+    def register_marketplace_entry(self, entry_id: str, entry: Dict[str, Any]) -> None:
+        self._marketplace[entry_id] = dict(entry)
+        self._persist("marketplace", entry_id, entry)
+
+    def list_marketplace_entries(self) -> List[Dict[str, Any]]:
+        return list(self._marketplace.values())
+
+    def conformance_report(self, adapter_id: str, contract_ids: List[str]) -> AdapterConformance:
+        missing = [contract_id for contract_id in contract_ids if contract_id not in self._contracts]
+        status = "pass" if not missing else "partial"
+        notes = [f"missing:{contract_id}" for contract_id in missing]
+        return AdapterConformance(adapter_id=adapter_id, contract_id=",".join(contract_ids), status=status, notes=notes)
+
     # Lightweight helper to store a LocalProblem as a contract reference
     def register_local_problem(self, contract_id: str, lp: LocalProblem) -> None:
         """Register a LocalProblem with default metadata."""
-        spec = lp.dict()
+        spec = model_to_dict(lp)
         spec["_meta"] = {
             "version": 1,
             "timestamp": time.time(),
             "nonce": secrets.token_hex(8),
         }
         self.register_contract(contract_id, spec)
+
+    def _init_db(self) -> None:
+        assert self._conn is not None
+        self._conn.execute(
+            "CREATE TABLE IF NOT EXISTS registry_entries (bucket TEXT NOT NULL, entry_id TEXT NOT NULL, payload TEXT NOT NULL, PRIMARY KEY (bucket, entry_id))"
+        )
+        self._conn.commit()
+        cursor = self._conn.execute("SELECT bucket, entry_id, payload FROM registry_entries")
+        for row in cursor:
+            payload = json.loads(row["payload"])
+            bucket = row["bucket"]
+            entry_id = row["entry_id"]
+            if bucket == "contracts":
+                self._contracts[entry_id] = payload
+            elif bucket == "templates":
+                self._templates[entry_id] = payload
+            elif bucket == "deltas":
+                self._deltas[entry_id] = payload
+            elif bucket == "marketplace":
+                self._marketplace[entry_id] = payload
+
+    def _persist(self, bucket: str, entry_id: str, payload: Dict[str, Any]) -> None:
+        if self._conn is None:
+            return
+        self._conn.execute(
+            "INSERT OR REPLACE INTO registry_entries(bucket, entry_id, payload) VALUES (?, ?, ?)",
+            (bucket, entry_id, json.dumps(payload, sort_keys=True)),
+        )
+        self._conn.commit()

src/energysphere/server/main.py

@@ -3,14 +3,19 @@ from __future__ import annotations
 from fastapi import FastAPI
 from pydantic import BaseModel
 
+from energysphere.compat import model_to_dict
+from energysphere.governance import GovernanceLedger
+from energysphere.models import ContractTemplate, LocalProblem, PlanDelta
 from energysphere.registry import GraphContractRegistry
-from energysphere.models import LocalProblem
+from energysphere.sync import DeltaSyncEngine
 
 app = FastAPI(title="EnergiBridge MVP API")
 
 # Simple in-memory stores
 registry = GraphContractRegistry()
 adapters_registry: dict[str, dict[str, str]] = {}
+ledger = GovernanceLedger()
+sync_engine = DeltaSyncEngine(replica_id="api")
 
 
 class LocalProblemDTO(BaseModel):
@@ -41,3 +46,49 @@ class AdapterDTO(BaseModel):
 def register_adapter(dto: AdapterDTO):
     adapters_registry[dto.adapter_id] = {"description": dto.description or ""}
     return {"registered": True, "adapter_id": dto.adapter_id}
+
+
+@app.post("/contracts/templates")
+def register_contract_template(template: ContractTemplate):
+    registry.register_contract_template(template.template_id, template)
+    return {"registered": True, "template_id": template.template_id}
+
+
+@app.get("/contracts/templates")
+def list_contract_templates():
+    return registry.list_contract_templates()
+
+
+@app.post("/deltas")
+def register_plan_delta(delta: PlanDelta):
+    registry.register_plan_delta(delta)
+    envelope = sync_engine.issue_delta(delta)
+    return {"registered": True, "delta": model_to_dict(delta), "envelope": model_to_dict(envelope)}
+
+
+class DeltaBatchDTO(BaseModel):
+    deltas: list[PlanDelta]
+
+
+@app.post("/sync/reconcile")
+def reconcile_deltas(batch: DeltaBatchDTO):
+    envelopes = [sync_engine.issue_delta(delta) for delta in batch.deltas]
+    merged = sync_engine.reconcile(envelopes)
+    return {"merged": [model_to_dict(entry) for entry in merged]}
+
+
+class LedgerEventDTO(BaseModel):
+    event_type: str
+    actor: str
+    payload: dict[str, object] | None = None
+
+
+@app.post("/governance/events")
+def append_governance_event(event: LedgerEventDTO):
+    entry = ledger.append_event(event.event_type, event.actor, event.payload)
+    return {"entry": model_to_dict(entry), "valid": ledger.verify_chain()}
+
+
+@app.get("/governance/events")
+def list_governance_events():
+    return [model_to_dict(entry) for entry in ledger.list_entries()]

src/energysphere/sync.py

@@ -0,0 +1,63 @@
+from __future__ import annotations
+
+import hashlib
+import json
+from typing import Iterable, List
+
+from .compat import model_to_dict
+from .models import DeltaEnvelope, PlanDelta
+
+
+class DeltaSyncEngine:
+    """Deterministic reconciliation for offline-first plan deltas."""
+
+    def __init__(self, replica_id: str) -> None:
+        self.replica_id = replica_id
+        self._sequence = 0
+        self._history: list[DeltaEnvelope] = []
+
+    def issue_delta(self, plan_delta: PlanDelta, previous_hash: str | None = None) -> DeltaEnvelope:
+        self._sequence += 1
+        envelope = DeltaEnvelope(
+            replica_id=self.replica_id,
+            sequence=self._sequence,
+            plan_delta=plan_delta,
+            previous_hash=previous_hash,
+        )
+        envelope.entry_hash = self._hash_envelope(envelope)
+        self._history.append(envelope)
+        return envelope
+
+    def reconcile(self, envelopes: Iterable[DeltaEnvelope]) -> list[DeltaEnvelope]:
+        merged: dict[str, DeltaEnvelope] = {}
+        for envelope in envelopes:
+            key = envelope.plan_delta.delta_id
+            existing = merged.get(key)
+            if existing is None or self._rank(envelope) > self._rank(existing):
+                if envelope.entry_hash is None:
+                    envelope.entry_hash = self._hash_envelope(envelope)
+                merged[key] = envelope
+        return sorted(merged.values(), key=self._rank)
+
+    def history(self) -> list[DeltaEnvelope]:
+        return list(self._history)
+
+    def _rank(self, envelope: DeltaEnvelope) -> tuple[int, float, str]:
+        return (
+            envelope.sequence,
+            envelope.plan_delta.timestamp,
+            envelope.plan_delta.delta_id,
+        )
+
+    def _hash_envelope(self, envelope: DeltaEnvelope) -> str:
+        payload = {
+            "replica_id": envelope.replica_id,
+            "sequence": envelope.sequence,
+            "plan_delta": model_to_dict(envelope.plan_delta),
+            "previous_hash": envelope.previous_hash,
+        }
+        blob = json.dumps(payload, sort_keys=True, separators=(",", ":")).encode("utf-8")
+        return hashlib.sha256(blob).hexdigest()
+
+
+__all__ = ["DeltaSyncEngine"]

test.sh

@@ -3,7 +3,7 @@ set -euo pipefail
 export PYTHONPATH=./src
 echo "Installing dependencies..."
 pip install --upgrade pip setuptools wheel >/dev/null 2>&1 || true
-pip install "pydantic>=1.10.2" "fastapi>=0.90.0" "uvicorn[standard]>=0.18.0" "pytest>=7.0.0" >/dev/null 2>&1 || true
+pip install "pydantic>=1.10.2" "fastapi>=0.90.0" "httpx>=0.23.0" "uvicorn[standard]>=0.18.0" "pytest>=7.0.0" >/dev/null 2>&1 || true
 echo "Running tests..."
 pytest -q
 echo "Running packaging build..."

tests/test_governance_sync_api.py

@@ -0,0 +1,54 @@
+from energysphere.governance import GovernanceLedger
+from energysphere.models import ContractTemplate, PlanDelta
+from energysphere.registry import GraphContractRegistry
+from energysphere.server.main import app
+from energysphere.sync import DeltaSyncEngine
+
+from fastapi.testclient import TestClient
+
+
+def test_governance_ledger_is_chained_and_verified():
+    ledger = GovernanceLedger(signing_secret="secret")
+    ledger.append_event("policy.approved", "alice", {"policy_id": "p-1"})
+    ledger.append_event("policy.updated", "bob", {"policy_id": "p-1"})
+
+    assert ledger.verify_chain() is True
+    assert len(ledger.list_entries()) == 2
+
+
+def test_delta_sync_deduplicates_by_delta_id():
+    engine = DeltaSyncEngine(replica_id="site-a")
+    first = engine.issue_delta(PlanDelta(delta_id="d-1", changes={"a": 1}, timestamp=1.0))
+    second = engine.issue_delta(PlanDelta(delta_id="d-1", changes={"a": 2}, timestamp=2.0))
+
+    merged = engine.reconcile([first, second])
+
+    assert len(merged) == 1
+    assert merged[0].plan_delta.changes == {"a": 2}
+
+
+def test_registry_and_api_support_templates_and_ledger():
+    registry = GraphContractRegistry()
+    template = ContractTemplate(
+        template_id="tmpl-1",
+        name="meter-template",
+        domain="electricity",
+        fields={"site_id": "string", "load": "number"},
+    )
+    registry.register_contract_template(template.template_id, template)
+    report = registry.conformance_report("adapter-1", ["missing-contract"])
+
+    assert registry.list_contract_templates()[0]["template_id"] == "tmpl-1"
+    assert report.status == "partial"
+    assert "missing:missing-contract" in report.notes
+
+    client = TestClient(app)
+    response = client.post(
+        "/governance/events",
+        json={"event_type": "policy.approved", "actor": "alice", "payload": {"policy_id": "p-2"}},
+    )
+
+    assert response.status_code == 200
+    body = response.json()
+    assert body["valid"] is True
+    assert body["entry"]["event_type"] == "policy.approved"