- New docs/algorithm.md: developer-facing technical reference covering
  coordinate frames, ADC sensor cal (offset+gain), baseline measurement,
  profile generation, runtime calibration flow, sym3axis estimator,
  ADC saturation limits, and data lineage. README points to it.
- status.md §2.7: today's session summary — sensor cal applied
  (bd6dc0c6), skeleton ID arg accepted (4eafabdc

), and the baseline
  saturation edge case discovered (coil_y = 66.6 µT cal, 1.4 µT
  margin to ADC limit).
- status.md §4 TODO: check off completed items (R_cp sign verified
  via off-diagonal evidence, sensor cal applied, skeleton ID fix);
  rewrite §4.2 around the ADC-orientation-then-remeasure plan;
  mark §4.5 #1 (read_field_uT saturation detection) priority ↑↑
  given the near-saturation baseline.

(Obsidian DACS PoC v1.2 notes also updated locally — not in repo.)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>