> **Historical provenance document — superseded.** This file preserves an earlier project state. It is not the current scientific interpretation. The canonical v0.3 position is that galaxy-specific structural fingerprints are reproducible and organized; sampling and preparation sensitivity describe how the fingerprints are expressed rather than negating their existence.

# Changelog

## v0.1.1 — 2026-07-26 — Real SPARC preparation

- Added the three immutable SPARC source files supplied by the user.
- Added one deterministic corpus-preparation script; no downloader and no
  additional generator framework.
- Froze `Υdisk = 0.5` and `Υbul = 0.7` at 3.6 μm.
- Preserved negative gas contributions with `Vgas*abs(Vgas)`.
- Replaced the invalid 64-point interpolation ladder with observed-radius
  `sort_unique(log10(gbar))`.
- Prepared 3,389 valid radial rows from 3,391 source rows.
- Documented two non-positive signed-baryonic exclusions in UGC01281.
- Verified exact agreement between all 175 ZIP members and the combined
  mass-model table.
- Froze PRIMARY and five sensitivity sample branches.
- Generated and validated 175 paired chamber input ladders.
- Marked status `DATA_PREPARED_CHAMBERS_NOT_RUN`.
- Did not execute STRUC-I, STRUC-PERC-I, model comparison, or nulls.

## v0.1.0 — 2026-07-26

- Replaced hypothetical margin, effective-dimension, boundary-distance, and
  route-history predictors with chamber-native outputs.
- Added both canonical chamber HTML instruments without modification.
- Registered a provisional whole-galaxy baryonic-acceleration ladder.
- Removed the invalid radial-order null because both chambers sort inputs.
- Initialized the result record as `NOT_RUN`.
