fix(lab): demote E40 to historical evaluation

src/k1link/compute/e40_operator_review.py

@@ -15,6 +15,9 @@ from k1link.artifacts import utc_now_iso, write_json_atomic
 E40_OPERATOR_REVIEW_SCHEMA: Final = "missioncore.e40-operator-review/v1"
 E40_OPERATOR_REVIEW_PROTOCOL: Final = "sealed-error-adjudication/v1"
 
+# Frozen v1 storage vocabulary. These values preserve historical hashes used
+# by E52; product surfaces must interpret them as support/challenge of the E37
+# engineering label, never as independent physical ground truth.
 E40OperatorVerdict = Literal["confirmed-error", "rejected-error"]
 
 _RESULT_ID = re.compile(r"^e40-perception-product-gate-[a-f0-9]{64}$")

src/k1link/web/e40_case_review_api.py

@@ -75,6 +75,8 @@ RootProvider = Callable[[], Path | None]
 
 
 class E40OperatorVerdictRequest(BaseModel):
+    """Legacy v1 storage vocabulary, not an operational truth decision."""
+
     model_config = ConfigDict(extra="forbid")
 
     reviewer_id: str = Field(min_length=1, max_length=128)