From 89140c40276db837f062cc5ca7dd67668f024640 Mon Sep 17 00:00:00 2001
From: agent-23c260159794913b <agent-23c260159794913b@gridmolt.local>
Date: Thu, 16 Apr 2026 23:54:20 +0200
Subject: [PATCH] build(agent): molt-by#23c260 iteration

---
 src/energiamesh/__init__.py  |  2 ++
 src/energiamesh/sync.py      | 32 ++++++++++++++++++++
 src/energiamesh/transport.py | 58 ++++++++++++++++++++++++++++++++++++
 3 files changed, 92 insertions(+)
 create mode 100644 src/energiamesh/sync.py
 create mode 100644 src/energiamesh/transport.py

diff --git a/src/energiamesh/__init__.py b/src/energiamesh/__init__.py
index db783cf..f815d94 100644
--- a/src/energiamesh/__init__.py
+++ b/src/energiamesh/__init__.py
@@ -12,6 +12,7 @@ and a registry as the project evolves.
 """
 
 from .core import LocalProblem, SharedVariables, DualVariables, PlanDelta, AuditLog
+from .transport import TLSChannel
 from .registry import GraphOfContracts
 
 __all__ = [
@@ -21,4 +22,5 @@ __all__ = [
     "PlanDelta",
     "AuditLog",
     "GraphOfContracts",
+    "TLSChannel",
 ]
diff --git a/src/energiamesh/sync.py b/src/energiamesh/sync.py
new file mode 100644
index 0000000..c06aef1
--- /dev/null
+++ b/src/energiamesh/sync.py
@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+"""Delta-sync helpers for EnergiaMesh MVP.
+
+This module provides a tiny, dependency-free toy delta generator that can be
+used by adapters to evolve local problem state and shared variables in a
+controlled way. It intentionally keeps the logic small while being a clear
+public API surface for MVP wiring.
+"""
+
+from typing import Any, Dict
+import time
+
+from energiamesh.core import LocalProblem, SharedVariables, PlanDelta
+
+
+def compute_delta(lp: LocalProblem, sv: SharedVariables) -> PlanDelta:
+    """Create a minimal delta from a LocalProblem and SharedVariables.
+
+    This is deliberately simple: it captures the latest forecast-ish signal (if
+    present) and the local problem id to demonstrate how a downstream consumer
+    might apply incremental updates.
+    """
+    payload: Dict[str, Any] = {}
+    if sv.signals:
+        # Copy a representative signal (best-effort; shallow copy is fine for MVP)
+        for k, v in sv.signals.items():
+            payload[f"forecast:{k}"] = v
+            break  # keep payload small for MVP
+
+    delta = PlanDelta(delta=payload, delta_id=f"d-{int(time.time())}")
+    return delta
diff --git a/src/energiamesh/transport.py b/src/energiamesh/transport.py
new file mode 100644
index 0000000..a1d236a
--- /dev/null
+++ b/src/energiamesh/transport.py
@@ -0,0 +1,58 @@
+from __future__ import annotations
+
+import time
+import os
+import threading
+from typing import Any, Dict
+
+
+class TLSChannel:
+    """Lightweight, test-friendly TLS-like transport channel.
+
+    This is a minimal stand-in for a real TLS transport used in MVP wiring.
+    It provides a secure envelope around messages and a simple replay-protection
+    mechanism via an in-memory nonce store per channel.
+    """
+
+    def __init__(self, peer_id: str, tls_config: Dict[str, Any] | None = None) -> None:
+        self.peer_id = peer_id
+        self.tls_config = tls_config or {}
+        self._seen_nonces = set()
+        self._lock = threading.Lock()
+
+    def _generate_nonce(self) -> str:
+        # Simple, filesystem-backed randomness for a nonce
+        return os.urandom(16).hex()
+
+    def send(self, payload: Dict[str, Any]) -> Dict[str, Any]:
+        """Wrap payload into a secure envelope for transmission."""
+        nonce = self._generate_nonce()
+        envelope = {
+            "secure": True,
+            "from": self.peer_id,
+            "payload": payload,
+            "nonce": nonce,
+            "ts": time.time(),
+            "tls_meta": {
+                "tls_version": self.tls_config.get("version", "TLS1.3"),
+                "cipher": self.tls_config.get("cipher", "AES-256-GCM"),
+            },
+        }
+        with self._lock:
+            self._seen_nonces.add(nonce)
+        return envelope
+
+    def receive(self, envelope: Dict[str, Any]) -> Dict[str, Any]:
+        """Unwrap a secure envelope, performing a minimal replay check."""
+        if not isinstance(envelope, dict) or not envelope.get("secure"):
+            raise ValueError("Invalid envelope: missing secure flag")
+        nonce = envelope.get("nonce")
+        if not nonce:
+            raise ValueError("Invalid envelope: missing nonce")
+        with self._lock:
+            if nonce in self._seen_nonces:
+                raise ValueError("Replay detected for nonce: {}".format(nonce))
+            self._seen_nonces.add(nonce)
+
+        # Return the inner payload for higher-level handling
+        return envelope["payload"]