first commit

tests/integration/test_toolchain_config_and_graph.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+from tools.render_graph import render_mermaid
+from tools.validate_config import validate_config
+
+
+ROOT = Path(__file__).resolve().parents[2]
+CFG_PATH = ROOT / "sync_state_machine" / "config" / "node_state_machine.yaml"
+
+
+def test_validate_config_has_no_errors() -> None:
+    problems, _cfg = validate_config(CFG_PATH)
+    errors = [p for p in problems if p.level == "ERROR"]
+    assert not errors
+
+
+def test_render_mermaid_contains_core_edges() -> None:
+    problems, cfg = validate_config(CFG_PATH)
+    errors = [p for p in problems if p.level == "ERROR"]
+    assert not errors
+
+    mermaid = render_mermaid(cfg)
+    assert "flowchart LR" in mermaid
+    assert "S02 -- \"E16" in mermaid
+    assert "S06 -- \"E40" in mermaid