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+# Rain EP Released-Drift Profile
+
+## Scope
+
+This protocol asks whether a local affine predictor adds value beyond a local
+intercept when hardware update bias changes with the adaptive parameter state.
+It is a controlled neural-network transfer of a shape measured in released
+physical traces. It is not a reproduction of the resistor hardware and is not
+labeled as a real-hardware neural-network result.
+
+The source is the committed analysis
+`results/physical_bias/p0_state_dependence.json`, derived from Zenodo record
+15692914, release v1.0.1. For each of four measured edges, the report supplies
+an affine offset, local gate-voltage slope, and the gate range visited in the
+retained drift traces. The transfer profile divides both the offset and the
+slope times observed gate range by the RMS of the four offsets. This freezes
+the following dimensionless values without a task-accuracy fit:
+
+- offsets: `0.93562, 1.60206, -0.10014, 0.74026`;
+- full-range state variations: `0.52595, 0.31317, 0.38320, -0.04782`.
+
+Neural parameters are deterministically assigned these four profiles. Their
+initial local update-offset RMS is set by `bias_ratio`; parameter displacement
+in units of that tensor's initial parameter RMS maps through `tanh` to the
+measured state-range coordinate. This mapping preserves the measured relative
+state dependence but does not claim that resistor gate volts equal neural
+weight units.
+
+## Local observation contract
+
+At a neutral probe, the teaching input to the local update circuit is disabled.
+The corrector receives the resulting measured circuit output at its current
+parameter state. It is not given an externally calibrated coefficient. An
+intercept-only predictor and affine SDIL receive identical probes. All
+parameters probe in parallel, so probe count is independent of parameter count;
+each parameter stores its own predictor coefficients.
+
+## R0 development screen
+
+R0 begins only after `dillavou_c0` finishes. It uses the same 10,000/2,000
+training-only split as development, batch size 128, one epoch, fixed bias ratio
+1.0, and the released affine profile. Eight cells run:
+
+1. clean positive EP;
+2. raw released-profile bias;
+3. intercept-only, one initial probe;
+4. affine SDIL, one initial probe;
+5. intercept-only, one initial probe then every 10 steps;
+6. affine SDIL with the same probes;
+7. intercept-only, one initial probe then every 50 steps;
+8. affine SDIL with the same probes.
+
+R0 is a mechanics/development screen. A useful result requires affine SDIL to
+have lower held-out residual bias and higher task accuracy than the matched
+intercept-only arm. Final evidence additionally requires multiple seeds, a
+frozen probe cadence, measurement noise/quantization, and the strong-clamp
+baseline.