research: compare Jev intent state with the previous turn

V0 on the existing 157 real rows matches the 09-19 cache. The staging extract has no case linkage, so V1/V2 are unmeasured and the verdict stays 缺数据.

scripts/research/jev_intent_current.py

@@ -74,7 +74,7 @@ def _parse_content(text: str) -> dict[str, Any]:
     return payload
 
 
-def call_current(sample: Mapping[str, Any], *, timeout: float = 60.0) -> dict[str, Any]:
+def call_current(sample: Mapping[str, Any], *, timeout: float = 60.0, variant: str = "v0") -> dict[str, Any]:
     api_key = os.environ.get("DEEPSEEK_API_KEY") or ""
     if not api_key:
         raise RuntimeError("DEEPSEEK_API_KEY missing")
@@ -84,7 +84,7 @@ def call_current(sample: Mapping[str, Any], *, timeout: float = 60.0) -> dict[st
         "model": model,
         "messages": [
             {"role": "system", "content": _instructions(sample) + "\n" + JSON_SCHEMA_HINT},
-            {"role": "user", "content": json.dumps(build_state(sample), ensure_ascii=False)},
+            {"role": "user", "content": json.dumps(build_state(sample, variant=variant if variant == "v1" else "v0"), ensure_ascii=False)},
         ],
         "temperature": 0,
         "max_tokens": 256,
@@ -128,12 +128,12 @@ def call_current(sample: Mapping[str, Any], *, timeout: float = 60.0) -> dict[st
     }
 
 
-def call_current_retry(sample: Mapping[str, Any], *, retries: int = 4) -> dict[str, Any]:
+def call_current_retry(sample: Mapping[str, Any], *, retries: int = 4, variant: str = "v0") -> dict[str, Any]:
     last_error = ""
     delay = 1.0
     for _attempt in range(retries):
         try:
-            return call_current(sample)
+            return call_current(sample, variant=variant)
         except urllib.error.HTTPError as exc:
             last_error = f"HTTP{exc.code}"
             if exc.code in {429, 500, 502, 503, 529}: