fig: plot physical grid bias crossover

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+# Physical-grid P5 visual contract
+
+- Artifact: two-panel classification-error figure.
+- Target format: full-width paper figure; editable SVG/PDF plus PNG preview.
+- Core claim: local state-dependent residualization restores physical local learning and composes with overclamping.
+- Reviewer question: does SDIL improve downstream classification over raw learning, constant calibration, and overclamping under the same component imperfections?
+- Evidence layer: main result.
+- Source data: `results/physical_bias/p5_grid_bias_crossover.json`.
+- Statistics: eight trials per input diameter (two label rotations by four device draws); show every trial and the arithmetic mean, without inferred uncertainty intervals.
+- Panel map: (a) raw, per-edge constant calibration, and SDIL under standard clamping; (b) overclamping and overclamping plus SDIL.
+- Labels: classification error (%), input diameter (mV), method names, eight trials per diameter.
+- Caption role: state the physical-grid setting, trial count, component-error model, and perfect-result counts without extending the evidence to hardware measurements.
+- Output: `results/figs/physical_grid_p5.{svg,pdf,png}`.
+- Traceability: plotting code reads the committed JSON directly; no values are copied by hand.
+