Replaces rsv36-rsv47 placeholders with the SP3 Mech 5 diagnostic
slot names. Both name table sites (halt_nan + halt_grad_collapse)
updated identically per shared-contract migration principle
(feedback_no_partial_refactor).
Slot names mirror the audit doc table:
- 36-39: Adam m max-abs (trunk/value/branch/IQN)
- 40-43: Adam v max-abs (trunk/value/branch/IQN)
- 44-45: Weight max-abs (trunk/heads)
- 46: target_q post-clip
- 47: atom_span_max
When the fused kernel sets a slot bit, the readback log line names
the buffer that exceeded its ISV-derived threshold — providing
direct observability for SP3 mechanism effectiveness.
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