Added SourcesSettings interface and sources slice to StarmapSettings with migration 90→91; default active adapter is self-graph-yaml-frontmatter; purely additive, no behavioral change.
v107.0.12026-06-04
·Added SourcesSettings interface: active (string|null) + configurations map
·sources field added to StarmapSettings; CURRENT_SCHEMA_VERSION bumped to 91
·Migration 91 backfills new slice on load (same additive pattern as v90/minimap)