Constellation database v2 - explicit figure membership

86 figures: Alan MacRobert / Sky & Telescope charts published by IAU; Dominic Ford transcription.
Original source header is GPL-3.0-or-later; retained verbatim with full license in constellation-sources/.
IAU chart images: credit IAU and Sky & Telescope, CC BY4.0; source URLs per record.
Mensa and Microscopium: Stellarium Modern data, Stellarium team, CC BY-SA4.0. Exact source and license notice retained.
Coordinates: ESA1997 Hipparcos catalog, CDS I/239. Archive states CC-BY-NC3.0 IGO; original ReadMe retained.
Secondary cross-check: HYGv4.0 by David Nash, CC BY-SA4.0; not used to replace primary positions.
Pinned revisions, file hashes, projection and exceptions: constellations.json.
Each figure retains sourcePaths with exact source-file lines or JSON pointers. No chart-context stars or inferred cross-figure segments are allowed.

The audited database drives constellations.js. See Constellation-AUDIT.md for source review and runtime verification.
