v0.9.0

What's Changed

• Make backup restore and queue changes atomic and validated (issue #298) by @mapitman in #306
• Cap untrusted input size and harden XML parsing (issue #300) by @mapitman in #308
• Stop download retries on permanent errors and validate resumed downloads (issue #301) by @mapitman in #309
• Reduce per-item queries and full-row reads in feed refresh (issue #302) by @mapitman in #310
• Keep one Wear position DataItem per device (issue #303) by @mapitman in #311
• Enable R8 on release builds and run Room migration tests in CI (issue #304) by @mapitman in #312
• Clean up review leftovers: backup export errors, duplicate refresh code, timeouts (issue #305) by @mapitman in #313
• Keep PodcastIndex credentials out of backups and define Auto Backup scope (issue #299) by @mapitman in #307
• Remove unused app/schemas directory by @mapitman in #314
• Add README and technical/user documentation by @mapitman in #194
• Describe the three Gradle modules and current tooling in the technical design doc by @mapitman in #315
• Clear stale download records on launch (issue #316) by @mapitman in #317

Full Changelog: v0.8.1...v0.9.0