The AWS SDK requires a valid AWS region name even when using custom
S3-compatible endpoints (ARMOR/B2). Using "auto" as the region causes
an error: "Invalid region: region was not a valid DNS name."
This fixes the replay upload pipeline which was failing with the
invalid region error. Replays should now upload successfully to B2
via the ARMOR proxy.
Related to ai-code-battle-o43: Replay viewer verification task.
- Add s3.go with AWS SDK v2 S3Client wrapper for R2/B2 operations
- Implement listObjects, deleteObject, objectExists, uploadFile, copyObject, downloadObject
- Add s3_test.go with MockS3Client and comprehensive tests
- Wire promoteRecentReplaysForCycle() into build cycle in main.go
- Add fetchRecentMatchIDs() to query recent matches from PostgreSQL
- Add fetchExemptMatchIDs() to protect series/season/playlist matches from pruning
- Implement pruneR2CacheWithDB() for 10GB cap enforcement with exemptions
- Update go.mod with AWS SDK v2 dependencies
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
