Cleanup C1-C7: delete dead CuTeDSL FMHA, test probes, scratch files
- Deleted fmha.py (CuTeDSL slow path), FmhaKernel, Python KV merge
- Deleted fmha_sm100.cuh, fmha_sm100_tc.cuh, fmha_sm100_launch.cu, fmha_epilogue_sm100.cuh
- Moved fmha_qk_verify.cuh to tests/unit/qk_verify_kernel.cuh
- Deleted decode_sparse.py, decode_swa.py, kernels/decode/
- Deleted 46 test_d*.py probes, test_smem_*, test_cotiled_*, test_tmem_*,
test_smem_p_*, test_ultra_minimal, test_fmha_pv16, test_working_softmax_maybe
- Deleted root scratch: debug_linear.py, test_mapping.py, run_router_tests.py
- Moved archive/ to archived_plans/code_archive/
- Rewrote production.py: single fast path via 6-warp multi-tile kernel
- Added STATUS.md, audit_attention_live.md
- Moved NEXT_PRIORITIES*.md to archived_plans/
biondizzle
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