feat(plugins): share native session handoff and soften memory search

integrations/agent-plugin-core/tests/test_conformance.py

@@ -10,7 +10,6 @@ sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
 from conformance import run as conformance_run  # noqa: E402
 from conformance.run import _command_check  # noqa: E402
 
-
 PLUGIN_ROOT = Path(__file__).resolve().parents[1]
 RUNNER = PLUGIN_ROOT / "conformance" / "run.py"
 PYTHON_HOSTS = {"claude-code", "cursor", "codex", "kimi", "antigravity"}
@@ -101,6 +100,30 @@ def test_typescript_artifact_check_rejects_monorepo_imports(tmp_path: Path) -> N
     assert "monorepo source import" in result["output"]
 
 
+def test_handoff_packaging_rejects_missing_and_drifted_runtime(tmp_path: Path) -> None:
+    from conformance.artifacts import (
+        HANDOFF_RUNTIME_FILES,
+        TYPESCRIPT_ARTIFACTS,
+        verify_artifact,
+    )
+
+    dist = tmp_path / "dist"
+    dist.mkdir()
+    _, required = TYPESCRIPT_ARTIFACTS["opencode"]
+    for name in required:
+        target = tmp_path / name
+        target.parent.mkdir(parents=True, exist_ok=True)
+        target.write_text("", encoding="utf-8")
+    for name in HANDOFF_RUNTIME_FILES:
+        (dist / name).write_bytes((PLUGIN_ROOT / "python" / name).read_bytes())
+    assert verify_artifact("opencode", tmp_path, required)["status"] == "passed"
+
+    (dist / "session_handoff.py").write_text("# stale importer\n", encoding="utf-8")
+    assert "differs from shared source" in verify_artifact("opencode", tmp_path, required)["output"]
+    (dist / "session_handoff.py").unlink()
+    assert "missing package artifact: dist/session_handoff.py" in verify_artifact("opencode", tmp_path, required)["output"]
+
+
 def test_live_conformance_requires_an_explicit_mem0_key(tmp_path: Path) -> None:
     environment = dict(os.environ)
     environment.pop("MEM0_API_KEY", None)