新增 HHD 场加权标定模型与加权空载基线

field_gain/1 用坐标增益图对无旋向量场做 L1 场加权，以连续 30 帧加权中位数替代旧 raw 零点，实时入口暂不支持。目标测试 102 项与 lint_gate 通过；契约见 orisys-sdk/docs/field-gain-model.zh.md。

src/orisys/finger/runtime.py

@@ -14,6 +14,7 @@ from ..capture import (
     open_capture,
 )
 from ..configs import load_config
+from ..field_calibration import FIELD_IDENTITY, FIELD_PROFILE
 from ..frame_processors import FrameUnwarper
 from ..sensor import Sensor
 from ..unroll import (
@@ -326,9 +327,10 @@ class FingerRuntime:
 
             model = sensor.calibration
             uv_map = getattr(model, "coordinate_map", None)
-            if model.input_profile == "fn_delta_autocal_uv/1":
+            if model.input_profile in ("fn_delta_autocal_uv/1", FIELD_PROFILE):
                 if uv_map is None or uv_map.shape[:2] != (geometry.out_height, geometry.out_width):
                     raise ValueError("calibration coordinate map does not match finger output shape")
+            field_identity = FIELD_IDENTITY if model.input_profile == FIELD_PROFILE else None
             sensor.bind_calibration_context(build_context(
                 sensor._config, sensor.filters_state(),
                 geometry_sha256=sha256_file(mesh_path), source_scale=geometry.source_scale,
@@ -336,6 +338,7 @@ class FingerRuntime:
                 output_domain_sha256=domain_fingerprint(domain),
                 processing_backend="uv_unroll",
                 preprocessing={"flip_source_vertical": flip_source_vertical, "mirror": mirror},
+                field=field_identity,
             ))
 
         capture_config = CaptureConfig.from_camera_dict(
@@ -399,19 +402,25 @@ class FingerRuntime:
             selected = cal_mod.validate_for_device(selected, "finger", serial)
         context = None
         if getattr(selected, "schema_version", None) == 3:
-            if selected.input_profile == "fn_delta_autocal_uv/1":
+            if selected.input_profile in ("fn_delta_autocal_uv/1", FIELD_PROFILE):
                 uv_map = selected.coordinate_map
                 if uv_map is None or uv_map.shape[:2] != (self.geometry.out_height, self.geometry.out_width):
                     raise ValueError("calibration coordinate map does not match finger output shape")
+            field_identity = FIELD_IDENTITY if selected.input_profile == FIELD_PROFILE else None
             context = build_context(
                 self.geometry.config, sensor.filters_state(),
                 geometry_sha256=sha256_file(self.geometry.export_paths.mesh),
                 source_scale=self.geometry.source_scale, coordinates=selected.pipeline.get("coordinates"),
                 output_domain_sha256=domain_fingerprint(self.domain), processing_backend="uv_unroll",
                 preprocessing={"flip_source_vertical": self.frame_processor.flip_source_vertical,
-                               "mirror": sensor.mirror})
+                               "mirror": sensor.mirror},
+                field=field_identity)
         sensor.set_calibration(selected, context=context)
 
+    def declare_unloaded_reference(self, reference_id):
+        """Declare the unloaded window for a field model; the SDK medians 30 weighted frames."""
+        self.tactile.raw_sensor.declare_unloaded_reference(reference_id=reference_id)
+
     @property
     def calibration_status(self):
         """Copy the current per-axis calibration validity state."""