v0.15.0

Changelog

• 94eeda5 chore(release): promote v0.15.0
• 402c721 feat(amr): add --samples/--sample-file flags and fix --type help
• 6d0cc9b feat(output): auto-gzip output and infer format from filename
• cb408c8 fix(amr): case-insensitive partition and index path lookup