v0.7.2

Changelog

• fde6830 Bump version to 0.7.2, update changelog
• 1aa6369 schema: clarify 002_drop_idx_file_pos.sql is operator-facing only (#252)
• 5d0cfb7 shim: default to strict mode; add --allow-gaps opt-in (#258)
• b12aef1 shim: fix auth + wire ArchiveFetcher (closes #254 #255) (#256)