Wing Lian ff5d6393c8 replace legacy attention boolean flags with capability properties ...

Replace checks with capability-based properties derived from attn_implementation

This separates three concerns that were conflated under flash_attention:
1. Backend selection -> attn_implementation enum
2. Packing capability -> attn_supports_packing property
3. Flash-attn library dependency -> attn_uses_flash_lib property

2026-04-23 22:27:01 +00:00

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