重构RTK-IMU标定链路并完成机械先验工程验证

.gitignore

@@ -8,3 +8,22 @@ build/
 examples/synthetic_session/
 .venv/
 venv/
+
+# Local IDE state
+.vs/
+
+# RTK-IMU calibration process artifacts stay local. Keep only the reviewed
+# V3 result bundle explicitly listed below under version control.
+artifacts/rtk_imu_calibration_v2/
+artifacts/rtk_imu_calibration_v3/*
+!artifacts/rtk_imu_calibration_v3/README.md
+!artifacts/rtk_imu_calibration_v3/engineering_release_decision.json
+!artifacts/rtk_imu_calibration_v3/heldout_independent_innovation.json
+!artifacts/rtk_imu_calibration_v3/heldout_nonconverged_retry.json
+!artifacts/rtk_imu_calibration_v3/lever_information_window_selection.json
+!artifacts/rtk_imu_calibration_v3/lever_information_window_selection_refined.json
+!artifacts/rtk_imu_calibration_v3/mechanical_prior_engineering_47_window.json
+!artifacts/rtk_imu_calibration_v3/mechanical_prior_engineering_heldout.json
+!artifacts/rtk_imu_calibration_v3/mechanical_prior_rotation_sensitivity.json
+!artifacts/rtk_imu_calibration_v3/node_graph_free_information_selected_mechanical.json
+!artifacts/rtk_imu_calibration_v3/propagation_bias_root_cause_audit.json