允许 HHD 下采样率不同的标定保持兼容

按实际运行上下文核对其余处理参数，保留文件指纹与设备身份校验。115 项标定及运行时检查通过。

src/orisys/calibration_context.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import hashlib
 import json
+from copy import deepcopy
 from pathlib import Path
 
 import numpy as np
@@ -11,6 +12,29 @@ import numpy as np
 from .calibration import filters_fingerprint
 
 
+def _feature_signature(identity) -> str:
+    encoded = json.dumps(identity, sort_keys=True, separators=(",", ":"), allow_nan=False)
+    return hashlib.sha256(encoded.encode("utf-8")).hexdigest()
+
+
+class CalibrationContext(dict):
+    """Actual pipeline fields plus the runtime inputs needed to compare HHD settings.
+
+    JSON serialization contains only the actual fields. Retaining the signature
+    inputs lets old files differ in downsample without ignoring other hashed settings.
+    """
+
+    def __init__(self, fields, feature_identity):
+        super().__init__(fields)
+        self._feature_identity = deepcopy(feature_identity)
+
+    def signature_for_downsample(self, downsample: int) -> str:
+        """Recompute the runtime identity with only the requested HHD resolution."""
+        identity = deepcopy(self._feature_identity)
+        identity["tracker"]["hhd_downsample"] = downsample
+        return _feature_signature(identity)
+
+
 def sha256_file(path) -> str:
     return hashlib.sha256(Path(path).read_bytes()).hexdigest()
 
@@ -70,6 +94,5 @@ def build_context(config, filters=None, *, geometry_sha256=None, source_scale=No
         "source_scale": source_scale,
         "preprocessing": preprocessing or {},
     }
-    encoded = json.dumps(effective, sort_keys=True, separators=(",", ":"), allow_nan=False)
-    result["feature_signature_sha256"] = hashlib.sha256(encoded.encode("utf-8")).hexdigest()
-    return result
+    result["feature_signature_sha256"] = _feature_signature(effective)
+    return CalibrationContext(result, effective)