Constant DECODE_GQA_PACK_DECLARED 

pub const DECODE_GQA_PACK_DECLARED: bool = false;

The packed kernels are OFF unless explicitly armed.

Declared here rather than in kernels/<hw>/HARDWARE.toml because there is no receipt for this arm on any target yet: it is a launch-geometry change whose payoff (DECODE_GQA_PACK_WIDTHx fewer KV load instructions) trades against a measured occupancy cost — ptxas reports 227 registers for the FP8 twin and 243 for the BF16 one, zero spills, i.e. ONE resident CTA per SM, against 48/56 registers and up to five for the unpacked kernels. That trade can only be settled by an A/B on the box. AVAROK_ATTN_DECODE_GQA_PACK=1 is how that A/B is run — the same mechanism AVAROK_ATTN_DECODE_SPLITK=auto uses for the policy above. A target that wins the A/B moves this to a [defaults] row with the receipt beside it.