Mondo Diaz 55a38ad850 Add deduplication design doc, file size limits, and validation tests ...

- Add max_file_size (10GB) and min_file_size (1 byte) config options
- Add file size validation to regular and resumable upload endpoints
- Create comprehensive deduplication design document covering:
  - SHA256 algorithm selection rationale and migration path
  - Content-addressable storage model
  - S3 key derivation and prefix sharding
  - Duplicate detection workflow
  - Reference counting lifecycle
  - Edge cases and error handling
  - Collision detection strategy
  - Performance considerations
  - Operations runbook
- Add tests for empty file rejection and file size validation

2026-01-05 15:35:21 -06:00

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