diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..edb03f9
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,13 @@
+{
+  "name": "@wasmagent/protocol",
+  "version": "0.1.5",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "@wasmagent/protocol",
+      "version": "0.1.5",
+      "license": "Apache-2.0"
+    }
+  }
+}
diff --git a/schemas/aep/checkpoint-evidence.schema.json b/schemas/aep/checkpoint-evidence.schema.json
new file mode 100644
index 0000000..30fcab3
--- /dev/null
+++ b/schemas/aep/checkpoint-evidence.schema.json
@@ -0,0 +1,47 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://wasmagent.dev/schemas/aep/checkpoint-evidence.schema.json",
+  "title": "CheckpointEvidence",
+  "description": "Signed checkpoint and fork record — captures agent state at a checkpoint boundary, enabling provenance across forks and replay. Canonical source for wasmagent-js and wasmagent-train-replay.",
+  "type": "object",
+  "required": ["schema_version", "checkpoint_id", "parent_run_id", "state_digest", "created_at_ms"],
+  "properties": {
+    "schema_version": { "type": "string", "enum": ["checkpoint-evidence/v0.1"] },
+    "checkpoint_id": {
+      "type": "string",
+      "description": "Unique identifier for this checkpoint."
+    },
+    "parent_run_id": {
+      "type": "string",
+      "description": "The run_id of the originating AEP record this checkpoint was taken from."
+    },
+    "fork_of": {
+      "type": ["string", "null"],
+      "description": "If this checkpoint is a fork, the checkpoint_id of the ancestor checkpoint; null for root checkpoints."
+    },
+    "state_digest": {
+      "type": "string",
+      "description": "Cryptographic digest of the captured agent state at checkpoint time."
+    },
+    "created_at_ms": {
+      "type": "number",
+      "description": "Epoch-millisecond timestamp when the checkpoint was created."
+    },
+    "run_id": {
+      "type": "string",
+      "description": "The run_id assigned to the new run spawned from this checkpoint (if any)."
+    },
+    "signature": {
+      "type": "object",
+      "description": "Optional signature over the checkpoint payload for tamper evidence.",
+      "required": ["alg", "key_id", "sig"],
+      "properties": {
+        "alg": { "type": "string" },
+        "key_id": { "type": "string" },
+        "sig": { "type": "string" },
+        "bundle": { "type": "object" },
+        "transparency_log_ref": { "type": "string" }
+      }
+    }
+  }
+}
diff --git a/schemas/index.json b/schemas/index.json
index 800c5a4..38fa42c 100644
--- a/schemas/index.json
+++ b/schemas/index.json
@@ -70,6 +70,17 @@
       "consumers": ["wasmagent-js", "trace-pipeline"],
       "summary": "One record per compliance run."
     },
+    {
+      "id": "checkpoint-evidence",
+      "title": "CheckpointEvidence",
+      "path": "schemas/aep/checkpoint-evidence.schema.json",
+      "canonical_id": "https://wasmagent.dev/schemas/aep/checkpoint-evidence.schema.json",
+      "version": "checkpoint-evidence/v0.1",
+      "stability": "evolving",
+      "owners": ["wasmagent-protocol"],
+      "consumers": ["wasmagent-js", "wasmagent-train-replay"],
+      "summary": "Signed checkpoint and fork record — agent state at a checkpoint boundary for provenance across forks and replay."
+    },
     {
       "id": "rollout-wire",
       "title": "Rollout Wire Format",
diff --git a/tests/fixtures/invalid/checkpoint-evidence/example.json b/tests/fixtures/invalid/checkpoint-evidence/example.json
new file mode 100644
index 0000000..028d505
--- /dev/null
+++ b/tests/fixtures/invalid/checkpoint-evidence/example.json
@@ -0,0 +1,7 @@
+{
+  "schema_version": "checkpoint-evidence/v9.9",
+  "checkpoint_id": "cp-abc123",
+  "parent_run_id": "run-xyz789",
+  "state_digest": "sha256:a1b2c3d4",
+  "created_at_ms": 1737600000000
+}
diff --git a/tests/fixtures/valid/checkpoint-evidence/example.json b/tests/fixtures/valid/checkpoint-evidence/example.json
new file mode 100644
index 0000000..11d482e
--- /dev/null
+++ b/tests/fixtures/valid/checkpoint-evidence/example.json
@@ -0,0 +1,13 @@
+{
+  "schema_version": "checkpoint-evidence/v0.1",
+  "checkpoint_id": "cp-abc123",
+  "parent_run_id": "run-xyz789",
+  "fork_of": null,
+  "state_digest": "sha256:a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2",
+  "created_at_ms": 1737600000000,
+  "signature": {
+    "alg": "ed25519",
+    "key_id": "k1",
+    "sig": "base64sig=="
+  }
+}
diff --git a/tests/test_conformance.py b/tests/test_conformance.py
new file mode 100644
index 0000000..736ac10
--- /dev/null
+++ b/tests/test_conformance.py
@@ -0,0 +1,28 @@
+"""Pytest wrapper around the conformance harness.
+
+The canonical conformance logic lives in conformance.py (runnable as a
+standalone script).  This thin adapter re-exports its exit-code check
+as a pytest-collectable test so that ``pytest tests/ -x -q`` discovers
+and runs it.
+"""
+from __future__ import annotations
+
+import subprocess
+import sys
+from pathlib import Path
+
+
+def test_conformance() -> None:
+    """Run tests/conformance.py and fail if it returns non-zero."""
+    script = Path(__file__).resolve().parent / "conformance.py"
+    result = subprocess.run(
+        [sys.executable, str(script)],
+        capture_output=True,
+        text=True,
+    )
+    if result.returncode != 0:
+        print(result.stdout, file=sys.stdout)
+        print(result.stderr, file=sys.stderr)
+    assert result.returncode == 0, (
+        f"conformance.py exited {result.returncode}"
+    )