fix: enforce canonical factor contract json (#15)

tests/test_alpha_factors.py

@@ -7,6 +7,13 @@ import pandas as pd
 import pytest
 
 import quant_engine.alpha_factors as alpha_factors_module
+from quant_engine.factor_contracts import (
+    FactorContractError,
+    FactorInput,
+    ProducerIdentity,
+    factor_definition_from_alpha158,
+    factor_input_schema_digest,
+)
 from quant_engine.alpha_factors import (
     ALPHA158_REGISTRY,
     ALPHA158_PHASE1_OPERATOR_SPECS,
@@ -434,6 +441,50 @@ def test_alpha_registry_required_fields():
         assert required <= set(meta.keys()), f"{alpha_id} missing fields"
 
 
+def test_alpha_registry_adapts_to_definition_without_copying_formula_or_inputs():
+    factor_input = FactorInput(
+        "market",
+        "sha256:" + "1" * 64,
+        tuple(ALPHA158_REGISTRY["alpha_005"]["inputs"]),
+    )
+    definition = factor_definition_from_alpha158(
+        "alpha_005",
+        version="1.0.0",
+        parameters={},
+        inputs=(factor_input,),
+        implementation_digest="sha256:" + "2" * 64,
+        input_schema_digest=factor_input_schema_digest((factor_input,)),
+        valid_from="2026-01-01T00:00:00Z",
+        valid_until="2027-01-01T00:00:00Z",
+        warmup_sessions=10,
+        lag_sessions=1,
+        producer=ProducerIdentity("quant_engine", "1.0.0"),
+        code_revision="c" * 40,
+    )
+
+    assert definition.formula == ALPHA158_REGISTRY["alpha_005"]["formula"]
+    assert definition.inputs[0].required_columns == tuple(
+        ALPHA158_REGISTRY["alpha_005"]["inputs"]
+    )
+
+    incomplete = FactorInput("market", "sha256:" + "1" * 64, ("close",))
+    with pytest.raises(FactorContractError, match="exactly correspond"):
+        factor_definition_from_alpha158(
+            "alpha_005",
+            version="1.0.0",
+            parameters={},
+            inputs=(incomplete,),
+            implementation_digest="sha256:" + "2" * 64,
+            input_schema_digest=factor_input_schema_digest((incomplete,)),
+            valid_from="2026-01-01T00:00:00Z",
+            valid_until="2027-01-01T00:00:00Z",
+            warmup_sessions=10,
+            lag_sessions=1,
+            producer=ProducerIdentity("quant_engine", "1.0.0"),
+            code_revision="c" * 40,
+        )
+
+
 def test_get_alpha_meta_success():
     """已知 alpha_id 返回完整 meta。"""
     meta = get_alpha_meta("alpha_001")