3.1.0 Release Notes

• Added Constellation.BorderSegment plus StarManager.constellationBorders(for:), exposing precise border arcs (Dec/RA in radians) including Serpens’ split handling for richer constellation outlines.
• Introduced H3Utils with viewport polyfill support, automatic polar-slice handling, and pole-detection helpers to drive adaptive H3-based rendering without external glue code.
• StarManager.closeStars(around:maximumAngularDistance:maximumMagnitude:) now returns all stars within an angular radius, enabling multi-selection and highlighting flows.
• StarManager.stars(inH3Cell:) now takes an H3Index, derives the resolution automatically, and works seamlessly with the new H3 utilities.

API Changes

• StarManaging protocol updates: stars(inH3Cell:) signature switch to H3Index, new closeStars method, and a new constellationBorders(for:) requirement; the old closestStar and stars(inViewport:) APIs are removed.
• Constellation.Line now carries star1Id/star2Id instead of full Star instances; consumers should fetch star details via StarManaging when needed.
• Star.loadInfo/Star.withInfo accept any StarManaging, loosening coupling to the concrete manager.

Fixes & Improvements

• Corrected Bayer/Flamsteed combined formatting so Bayer letters no longer repeat the Flamsteed number, and StarInfo.displayName now prioritizes Bayer designations ahead of catalog IDs.
• Localized SpectralType’s SQLite metadata to avoid cross-module references and added @preconcurrency import annotations to silence concurrency warnings.
• Refined coordinate helpers (cartesianToLatLon, RA/Dec normalization) to return LatLng, keeping spherical math consistent across the new border and H3 workflows.