story: DGR-037 Bind llama.cpp to the standalone worker

tests/test_llama_shard_worker_binding.py

@@ -0,0 +1,46 @@
+"""DGR-037 structural guardrails for the standalone llama.cpp worker.
+
+The real GGUF lane is opt-in and needs a mounted artifact; these tests keep the
+default suite model-download-free while guarding the integration shape that a
+later real-model harness exercises.
+"""
+
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+WORKER = ROOT / "packages/node/native/worker"
+
+
+def test_worker_uses_the_private_llama_shardengine_not_the_fixture_engine():
+    service_header = (WORKER / "shard_service.h").read_text(encoding="utf-8")
+    service = (WORKER / "shard_service.cpp").read_text(encoding="utf-8")
+    engine = (WORKER / "llama_shard_engine.cpp").read_text(encoding="utf-8")
+    assert '#include "llama_shard_engine.h"' in service_header
+    assert "FakeShardEngine" not in service_header
+    assert "engine_.Execute(" in service
+    assert "llama_model_load_from_file" in engine
+    assert "llama_model_meshnet_range_report" in engine
+
+
+def test_worker_configuration_and_death_hook_are_explicit_and_opt_in():
+    main = (WORKER / "shard_worker_main.cpp").read_text(encoding="utf-8")
+    for name in (
+        "MESHNET_MODEL_ARTIFACT",
+        "MESHNET_MODEL_ARTIFACT_DIGEST",
+        "MESHNET_RUNTIME_RECIPE_DIGEST",
+        "MESHNET_SHARD_START_LAYER",
+        "MESHNET_SHARD_END_LAYER",
+        "MESHNET_INJECT_PROCESS_DEATH_AFTER_EXECUTIONS",
+    ):
+        assert name in main
+    assert "engine->Shutdown()" in main
+
+
+def test_identity_is_loaded_not_stream_supplied_and_health_reports_it():
+    source = (WORKER / "shard_service.cpp").read_text(encoding="utf-8")
+    assert "r.start_layer() == engine_.identity().start_layer" in source
+    assert "r.end_layer() == engine_.identity().end_layer" in source
+    assert "model artifact or runtime recipe digest does not match" in source
+    assert "resident_bytes" in source
+    assert '" range=["' in source