perf(storage): simplify cloud adapters to always-on write buffering
Removes dynamic high-volume mode switching complexity from all cloud
storage adapters (GCS, S3, R2, Azure). Write buffering is now always
enabled for consistent, predictable performance.
Changes:
- Remove highVolumeMode, lastVolumeCheck, volumeCheckInterval properties
- Remove checkVolumeMode() methods (~100 lines in S3 alone)
- Remove BRAINY_FORCE_HIGH_VOLUME env var checks
- Always use write buffer when available
- Preserve v6.2.6 cache-before-buffer fix for consistency
Benefits:
- Consistent behavior regardless of load
- Predictable performance characteristics
- -204 lines of code complexity
- Cloud storage always benefits from batching
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
David Snelling
26510ce7b8