diff --git a/tests/run_tests.py b/tests/run_tests.py
new file mode 100644
index 0000000..c638145
--- /dev/null
+++ b/tests/run_tests.py
@@ -0,0 +1,198 @@
+#!/usr/bin/env python3
+"""
+Test orchestrator — runs test suites and posts results to dev assay.
+
+Usage:
+  python tests/run_all_tests.py                          # all suites
+  python tests/run_all_tests.py api                      # one suite
+  python tests/run_all_tests.py roundtrip                # one suite
+  python tests/run_all_tests.py api/health               # single test
+  python tests/run_all_tests.py roundtrip/full_eras      # single test
+  python tests/run_all_tests.py api/health roundtrip/full_chat  # multiple tests
+
+Test names: suite/name (without the suite prefix in the test registry).
+  engine tests:    graph_load, node_instantiation, edge_types_complete,
+                   condition_reflex, condition_tool_output,
+                   frame_trace_reflex, frame_trace_expert, frame_trace_expert_with_interpreter
+  api tests:       health, eras_umsatz_api, eras_umsatz_artifact
+  roundtrip tests: nyx_loads, inject_artifact, inject_message, full_chat, full_eras
+"""
+
+import json
+import os
+import sys
+import time
+import urllib.request
+import uuid
+from datetime import datetime, timezone
+from dataclasses import dataclass, field, asdict
+
+RESULTS_ENDPOINT = os.environ.get('RESULTS_ENDPOINT', '')
+RUN_ID = os.environ.get('RUN_ID', str(uuid.uuid4())[:8])
+
+
+def _now_iso() -> str:
+    return datetime.now(timezone.utc).isoformat()
+
+
+@dataclass
+class TestResult:
+    run_id: str
+    test: str
+    suite: str
+    status: str  # 'pass', 'fail', 'running', 'error'
+    duration_ms: float = 0
+    error: str = ''
+    ts: str = ''
+
+
+def post_result(result: TestResult):
+    """Post a single test result to the dev assay endpoint."""
+    print(json.dumps(asdict(result)), flush=True)
+    if not RESULTS_ENDPOINT:
+        return
+    try:
+        payload = json.dumps(asdict(result)).encode()
+        req = urllib.request.Request(
+            RESULTS_ENDPOINT,
+            data=payload,
+            headers={'Content-Type': 'application/json'},
+        )
+        urllib.request.urlopen(req, timeout=5)
+    except Exception as e:
+        print(f'  [warn] failed to post result: {e}', file=sys.stderr)
+
+
+def run_test(name: str, suite: str, fn) -> TestResult:
+    """Run a single test function and return the result."""
+    result = TestResult(run_id=RUN_ID, test=name, suite=suite, status='running', ts=_now_iso())
+    post_result(result)
+
+    start = time.time()
+    try:
+        fn()
+        result.status = 'pass'
+    except AssertionError as e:
+        result.status = 'fail'
+        result.error = str(e)
+    except Exception as e:
+        result.status = 'error'
+        result.error = f'{type(e).__name__}: {e}'
+    result.duration_ms = round((time.time() - start) * 1000)
+    result.ts = _now_iso()
+
+    post_result(result)
+    return result
+
+
+def get_api_tests() -> dict:
+    """Load API tests from e2e_harness.py."""
+    sys.path.insert(0, os.path.dirname(__file__))
+    import e2e_harness
+    e2e_harness.ASSAY_BASE = os.environ.get('ASSAY_API', 'http://assay-runtime-test:8000').rstrip('/api')
+    # Skip browser-dependent tests
+    return {k: v for k, v in e2e_harness.TESTS.items() if 'takeover' not in k and 'panes' not in k}
+
+
+def get_roundtrip_tests() -> dict:
+    """Load Playwright roundtrip tests."""
+    sys.path.insert(0, os.path.dirname(__file__))
+    from test_roundtrip import TESTS
+    return TESTS
+
+
+def get_engine_tests() -> dict:
+    """Load engine-level tests (no LLM, no network)."""
+    sys.path.insert(0, os.path.dirname(__file__))
+    from test_engine import TESTS
+    return TESTS
+
+
+SUITES = {
+    'engine': get_engine_tests,
+    'api': get_api_tests,
+    'roundtrip': get_roundtrip_tests,
+}
+
+
+def parse_filters(args: list[str]) -> tuple[set[str] | None, set[str]]:
+    """Parse CLI args into (suite_filter, test_filter).
+
+    Returns:
+        suite_filter: set of suite names, or None for all suites
+        test_filter: set of 'suite/test' names (empty = run all in suite)
+    """
+    if not args:
+        return None, set()
+
+    suites = set()
+    tests = set()
+    for arg in args:
+        if '/' in arg:
+            tests.add(arg)
+            suites.add(arg.split('/')[0])
+        else:
+            suites.add(arg)
+    return suites, tests
+
+
+def run_suite(suite_name: str, tests: dict, test_filter: set[str]) -> list[TestResult]:
+    """Run tests from a suite, optionally filtered."""
+    results = []
+    for name, fn in tests.items():
+        # Apply test filter if specified
+        full_name = f'{suite_name}/{name}'
+        # Strip suite prefix for matching (roundtrip/full_eras matches roundtrip_full_eras)
+        short_name = name.replace(f'{suite_name}_', '')
+        if test_filter and full_name not in test_filter and f'{suite_name}/{short_name}' not in test_filter:
+            continue
+
+        r = run_test(name, suite_name, fn)
+        results.append(r)
+        status = 'PASS' if r.status == 'pass' else 'FAIL'
+        print(f'  [{status}] {suite_name}/{name} ({r.duration_ms:.0f}ms)', flush=True)
+        if r.error:
+            print(f'           {r.error[:200]}', flush=True)
+    return results
+
+
+def main():
+    suite_filter, test_filter = parse_filters(sys.argv[1:])
+
+    print(f'=== Test Run {RUN_ID} ===', flush=True)
+    if suite_filter:
+        print(f'Filter: suites={suite_filter}, tests={test_filter or "all"}', flush=True)
+    print(f'ASSAY_API: {os.environ.get("ASSAY_API", "not set")}', flush=True)
+    print(f'NYX_URL: {os.environ.get("NYX_URL", "not set")}', flush=True)
+    print(flush=True)
+
+    all_results = []
+
+    for suite_name, loader in SUITES.items():
+        if suite_filter and suite_name not in suite_filter:
+            continue
+        print(f'--- {suite_name} ---', flush=True)
+        tests = loader()
+        all_results.extend(run_suite(suite_name, tests, test_filter))
+        print(flush=True)
+
+    # Summary
+    passed = sum(1 for r in all_results if r.status == 'pass')
+    failed = sum(1 for r in all_results if r.status in ('fail', 'error'))
+    total_ms = sum(r.duration_ms for r in all_results)
+    print(f'=== {passed} passed, {failed} failed, {len(all_results)} total ({total_ms:.0f}ms) ===', flush=True)
+
+    if RESULTS_ENDPOINT:
+        summary = TestResult(
+            run_id=RUN_ID, test='__summary__', suite='summary',
+            status='pass' if failed == 0 else 'fail',
+            duration_ms=total_ms,
+            error=f'{passed} passed, {failed} failed',
+        )
+        post_result(summary)
+
+    sys.exit(1 if failed else 0)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/tests/test_engine.py b/tests/test_engine.py
new file mode 100644
index 0000000..d1cfc70
--- /dev/null
+++ b/tests/test_engine.py
@@ -0,0 +1,491 @@
+"""Engine test suite — tests graph loading, node instantiation, frame engine
+routing, conditions, and trace structure. No LLM calls — all nodes mocked.
+
+Tests:
+  graph_load           — load_graph returns correct structure for all graphs
+  node_instantiation   — instantiate_nodes creates all roles from registry
+  edge_types_complete  — all 3 edge types present, no orphan nodes
+  condition_reflex     — reflex condition fires on social+trivial only
+  condition_tool_output — has_tool_output condition fires when tool data present
+  frame_trace_reflex   — reflex path produces 2-frame trace
+  frame_trace_expert   — expert path produces correct frame sequence
+  frame_trace_director — director path produces correct frame sequence
+"""
+
+import asyncio
+import os
+import sys
+import time
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
+
+from agent.engine import load_graph, instantiate_nodes, _graph_from_module
+from agent.frame_engine import FrameEngine, FrameTrace, FrameRecord
+from agent.types import (
+    Envelope, Command, InputAnalysis, ThoughtResult,
+    DirectorPlan, PARouting, InterpretedResult, Artifact,
+)
+
+
+# --- Helpers ---
+
+class MockSink:
+    """Captures streamed output."""
+    def __init__(self):
+        self.deltas = []
+        self.controls = []
+        self.artifacts = []
+        self.done_count = 0
+
+    async def send_delta(self, text):
+        self.deltas.append(text)
+
+    async def send_controls(self, controls):
+        self.controls = controls
+
+    async def send_artifacts(self, artifacts):
+        self.artifacts = artifacts
+
+    async def send_done(self):
+        self.done_count += 1
+
+    def reset(self):
+        self.deltas.clear()
+
+
+class MockHud:
+    """Captures HUD events."""
+    def __init__(self):
+        self.events = []
+
+    async def __call__(self, data):
+        self.events.append(data)
+
+    def find(self, event):
+        return [e for e in self.events if e.get("event") == event]
+
+
+class MockMemorizer:
+    """Minimal memorizer for frame engine."""
+    def __init__(self):
+        self.state = {
+            "user_name": "test",
+            "user_mood": "neutral",
+            "topic": "testing",
+            "topic_history": [],
+            "language": "en",
+            "style_hint": "casual",
+            "facts": [],
+            "user_expectation": "conversational",
+        }
+
+    def get_context_block(self, sensor_lines=None, ui_state=None):
+        return "Memory: test context"
+
+    async def update(self, history):
+        pass
+
+
+class MockSensor:
+    """Minimal sensor for frame engine."""
+    def __init__(self):
+        self._flags = []
+
+    def note_user_activity(self):
+        pass
+
+    def update_browser_dashboard(self, dashboard):
+        pass
+
+    def get_context_lines(self):
+        return ["Sensors: test"]
+
+    def consume_flags(self):
+        flags = self._flags[:]
+        self._flags.clear()
+        return flags
+
+
+class MockUINode:
+    """Minimal UI node for frame engine."""
+    def __init__(self):
+        self.thinker_controls = []
+        self.state = {}
+        self._artifacts = []
+
+    @property
+    def current_controls(self):
+        return self.thinker_controls
+
+    @current_controls.setter
+    def current_controls(self, value):
+        self.thinker_controls = value
+
+    async def process(self, thought, history, memory_context=""):
+        return self.thinker_controls
+
+    def get_machine_summary(self):
+        return ""
+
+    def get_machine_controls(self):
+        return []
+
+    def get_artifacts(self):
+        return self._artifacts
+
+    def try_machine_transition(self, action):
+        return False, ""
+
+    async def process_local_action(self, action, data):
+        return None, []
+
+
+class MockInputNode:
+    """Returns a preconfigured Command."""
+    def __init__(self, intent="request", complexity="simple", topic="test", language="en"):
+        self._intent = intent
+        self._complexity = complexity
+        self._topic = topic
+        self._language = language
+
+    async def process(self, envelope, history, memory_context="", identity="", channel=""):
+        return Command(
+            analysis=InputAnalysis(
+                intent=self._intent, topic=self._topic,
+                complexity=self._complexity, language=self._language,
+                tone="casual",
+            ),
+            source_text=envelope.text,
+        )
+
+
+class MockOutputNode:
+    """Streams response text via sink."""
+    async def process(self, thought, history, sink, memory_context=""):
+        text = thought.response or "ok"
+        for i in range(0, len(text), 12):
+            await sink.send_delta(text[i:i+12])
+        await sink.send_done()
+        return text
+
+
+class MockPANode:
+    """Returns a preconfigured PARouting."""
+    def __init__(self, expert="eras", job="test query", thinking_msg="Working..."):
+        self._expert = expert
+        self._job = job
+        self._thinking_msg = thinking_msg
+
+    def set_available_experts(self, experts):
+        pass
+
+    async def route(self, command, history, memory_context="", identity="", channel=""):
+        return PARouting(
+            expert=self._expert,
+            job=self._job,
+            thinking_message=self._thinking_msg,
+            language="en",
+        )
+
+    async def route_retry(self, command, history, memory_context="", identity="",
+                          channel="", original_job="", errors=None):
+        return PARouting(expert=self._expert, job=f"retry: {self._job}", language="en")
+
+
+class MockExpertNode:
+    """Returns a preconfigured ThoughtResult."""
+    def __init__(self, response="expert result", tool_used="", tool_output="", errors=None):
+        self._response = response
+        self._tool_used = tool_used
+        self._tool_output = tool_output
+        self._errors = errors or []
+        self.send_hud = MockHud()
+
+    async def execute(self, job, language):
+        return ThoughtResult(
+            response=self._response,
+            tool_used=self._tool_used,
+            tool_output=self._tool_output,
+            errors=self._errors,
+        )
+
+
+class MockDirectorNode:
+    """Returns a preconfigured DirectorPlan."""
+    def __init__(self, goal="test", tools=None, hint=""):
+        self._goal = goal
+        self._tools = tools or []
+        self._hint = hint
+
+    async def decide(self, command, history, memory_context=""):
+        return DirectorPlan(
+            goal=self._goal,
+            tool_sequence=self._tools,
+            response_hint=self._hint,
+        )
+
+    def get_context_line(self):
+        return ""
+
+
+class MockThinkerNode:
+    """Returns a preconfigured ThoughtResult."""
+    def __init__(self, response="thought result", tool_used="", tool_output=""):
+        self._response = response
+        self._tool_used = tool_used
+        self._tool_output = tool_output
+
+    async def process(self, command, plan=None, history=None, memory_context=""):
+        return ThoughtResult(
+            response=self._response,
+            tool_used=self._tool_used,
+            tool_output=self._tool_output,
+        )
+
+
+class MockInterpreterNode:
+    """Returns a preconfigured InterpretedResult."""
+    async def interpret(self, tool_used, tool_output, job):
+        return InterpretedResult(
+            summary=f"Interpreted: {tool_used} returned data",
+            row_count=5,
+            key_facts=["5 rows"],
+        )
+
+
+def make_frame_engine(nodes, graph_name="v4-eras"):
+    """Create a FrameEngine with mocked dependencies."""
+    graph = load_graph(graph_name)
+    sink = MockSink()
+    hud = MockHud()
+    memorizer = MockMemorizer()
+    sensor = MockSensor()
+    ui = MockUINode()
+
+    engine = FrameEngine(
+        graph=graph,
+        nodes=nodes,
+        sink=sink,
+        history=[],
+        send_hud=hud,
+        sensor=sensor,
+        memorizer=memorizer,
+        ui_node=ui,
+        identity="test_user",
+        channel="test",
+    )
+    return engine, sink, hud
+
+
+# --- Tests ---
+
+def test_graph_load():
+    """load_graph returns correct structure for all frame-based graphs."""
+    for name in ["v3-framed", "v4-eras"]:
+        g = load_graph(name)
+        assert g["name"] == name, f"graph name mismatch: {g['name']} != {name}"
+        assert g["engine"] == "frames", f"{name} should use frames engine"
+        assert "nodes" in g and len(g["nodes"]) > 0, f"{name} has no nodes"
+        assert "edges" in g and len(g["edges"]) > 0, f"{name} has no edges"
+        assert "conditions" in g, f"{name} has no conditions"
+    # v1 should be imperative
+    g1 = load_graph("v1-current")
+    assert g1["engine"] == "imperative", "v1 should be imperative"
+
+
+def test_node_instantiation():
+    """instantiate_nodes creates all roles from registry."""
+    hud = MockHud()
+    for name in ["v3-framed", "v4-eras"]:
+        g = load_graph(name)
+        nodes = instantiate_nodes(g, hud)
+        for role in g["nodes"]:
+            assert role in nodes, f"missing node role '{role}' in {name}"
+        # Check specific node types exist
+        assert "input" in nodes
+        assert "output" in nodes
+        assert "memorizer" in nodes
+        assert "sensor" in nodes
+
+
+def test_edge_types_complete():
+    """All 3 edge types present in graph definitions, no orphan nodes."""
+    for name in ["v3-framed", "v4-eras"]:
+        g = load_graph(name)
+        edges = g["edges"]
+        edge_types = {e.get("type") for e in edges}
+        assert "data" in edge_types, f"{name} missing data edges"
+        assert "context" in edge_types, f"{name} missing context edges"
+        assert "state" in edge_types, f"{name} missing state edges"
+
+        # Every node should appear in at least one edge (from or to)
+        node_roles = set(g["nodes"].keys())
+        edge_nodes = set()
+        for e in edges:
+            edge_nodes.add(e["from"])
+            to = e["to"]
+            if isinstance(to, list):
+                edge_nodes.update(to)
+            else:
+                edge_nodes.add(to)
+        # runtime is a virtual target, not a real node
+        edge_nodes.discard("runtime")
+        missing = node_roles - edge_nodes
+        assert not missing, f"{name} has orphan nodes: {missing}"
+
+
+def test_condition_reflex():
+    """_check_condition('reflex') fires on social+trivial only."""
+    engine, _, _ = make_frame_engine({
+        "input": MockInputNode(),
+        "output": MockOutputNode(),
+        "memorizer": MockMemorizer(),
+        "sensor": MockSensor(),
+        "ui": MockUINode(),
+    }, "v4-eras")
+
+    # Should fire
+    cmd_social = Command(
+        analysis=InputAnalysis(intent="social", complexity="trivial"),
+        source_text="hi",
+    )
+    assert engine._check_condition("reflex", command=cmd_social), \
+        "reflex should fire for social+trivial"
+
+    # Should NOT fire
+    cmd_request = Command(
+        analysis=InputAnalysis(intent="request", complexity="simple"),
+        source_text="show data",
+    )
+    assert not engine._check_condition("reflex", command=cmd_request), \
+        "reflex should not fire for request+simple"
+
+    cmd_social_complex = Command(
+        analysis=InputAnalysis(intent="social", complexity="complex"),
+        source_text="tell me a long story",
+    )
+    assert not engine._check_condition("reflex", command=cmd_social_complex), \
+        "reflex should not fire for social+complex"
+
+
+def test_condition_tool_output():
+    """_check_condition('has_tool_output') fires when tool data present."""
+    engine, _, _ = make_frame_engine({
+        "input": MockInputNode(),
+        "output": MockOutputNode(),
+        "memorizer": MockMemorizer(),
+        "sensor": MockSensor(),
+        "ui": MockUINode(),
+    }, "v4-eras")
+
+    thought_with = ThoughtResult(
+        response="data", tool_used="query_db", tool_output="rows here",
+    )
+    assert engine._check_condition("has_tool_output", thought=thought_with), \
+        "should fire when tool_used and tool_output both set"
+
+    thought_without = ThoughtResult(response="just text")
+    assert not engine._check_condition("has_tool_output", thought=thought_without), \
+        "should not fire when no tool output"
+
+    thought_partial = ThoughtResult(response="x", tool_used="query_db", tool_output="")
+    assert not engine._check_condition("has_tool_output", thought=thought_partial), \
+        "should not fire when tool_output is empty string"
+
+
+def test_frame_trace_reflex():
+    """Reflex path: 2 frames (input → output), path='reflex'."""
+    nodes = {
+        "input": MockInputNode(intent="social", complexity="trivial"),
+        "output": MockOutputNode(),
+        "pa": MockPANode(),
+        "expert_eras": MockExpertNode(),
+        "interpreter": MockInterpreterNode(),
+        "memorizer": MockMemorizer(),
+        "sensor": MockSensor(),
+        "ui": MockUINode(),
+    }
+    engine, sink, hud = make_frame_engine(nodes, "v4-eras")
+
+    result = asyncio.get_event_loop().run_until_complete(
+        engine.process_message("hello")
+    )
+
+    trace = result["trace"]
+    assert trace["path"] == "reflex", f"expected reflex path, got {trace['path']}"
+    assert trace["total_frames"] == 2, f"expected 2 frames, got {trace['total_frames']}"
+    assert len(trace["frames"]) == 2
+    assert trace["frames"][0]["node"] == "input"
+    assert trace["frames"][1]["node"] == "output"
+    assert "reflex=True" in trace["frames"][0]["condition"]
+
+
+def test_frame_trace_expert():
+    """Expert path without tool output: F1(input)→F2(pa)→F3(expert)→F4(output+ui)."""
+    nodes = {
+        "input": MockInputNode(intent="request", complexity="simple"),
+        "output": MockOutputNode(),
+        "pa": MockPANode(expert="eras", job="get top customers"),
+        "expert_eras": MockExpertNode(response="Here are the customers"),
+        "interpreter": MockInterpreterNode(),
+        "memorizer": MockMemorizer(),
+        "sensor": MockSensor(),
+        "ui": MockUINode(),
+    }
+    engine, sink, hud = make_frame_engine(nodes, "v4-eras")
+
+    result = asyncio.get_event_loop().run_until_complete(
+        engine.process_message("show top customers")
+    )
+
+    trace = result["trace"]
+    assert trace["path"] == "expert", f"expected expert path, got {trace['path']}"
+    assert trace["total_frames"] >= 4, f"expected >=4 frames, got {trace['total_frames']}"
+    nodes_in_trace = [f["node"] for f in trace["frames"]]
+    assert nodes_in_trace[0] == "input"
+    assert nodes_in_trace[1] == "pa"
+    assert "expert_eras" in nodes_in_trace[2]
+
+
+def test_frame_trace_expert_with_interpreter():
+    """Expert path with tool output: includes interpreter frame, path='expert+interpreter'."""
+    nodes = {
+        "input": MockInputNode(intent="request", complexity="simple"),
+        "output": MockOutputNode(),
+        "pa": MockPANode(expert="eras", job="query customers"),
+        "expert_eras": MockExpertNode(
+            response="raw data",
+            tool_used="query_db",
+            tool_output="customer_name,revenue\nAcme,1000",
+        ),
+        "interpreter": MockInterpreterNode(),
+        "memorizer": MockMemorizer(),
+        "sensor": MockSensor(),
+        "ui": MockUINode(),
+    }
+    engine, sink, hud = make_frame_engine(nodes, "v4-eras")
+
+    result = asyncio.get_event_loop().run_until_complete(
+        engine.process_message("show customer revenue")
+    )
+
+    trace = result["trace"]
+    assert trace["path"] == "expert+interpreter", \
+        f"expected expert+interpreter path, got {trace['path']}"
+    nodes_in_trace = [f["node"] for f in trace["frames"]]
+    assert "interpreter" in nodes_in_trace, "interpreter frame missing"
+    assert trace["total_frames"] >= 5, f"expected >=5 frames, got {trace['total_frames']}"
+
+
+# --- Test registry (for run_tests.py) ---
+
+TESTS = {
+    'graph_load': test_graph_load,
+    'node_instantiation': test_node_instantiation,
+    'edge_types_complete': test_edge_types_complete,
+    'condition_reflex': test_condition_reflex,
+    'condition_tool_output': test_condition_tool_output,
+    'frame_trace_reflex': test_frame_trace_reflex,
+    'frame_trace_expert': test_frame_trace_expert,
+    'frame_trace_expert_with_interpreter': test_frame_trace_expert_with_interpreter,
+}