Adds a new HEALTH_DIAG[{epoch}]: pearl_egf_diag line immediately after
the aux_moe block in the per-epoch metrics section of training_loop.rs.
Reads all 13 SP14 ISV slots [383..396) — α_smoothed, α_raw, β, k_aux,
k_q, var_aux, var_q, var_α, q_dis_short, q_dis_long, gate1 state,
post_open_min, lockout — via the established read_isv_signal_at pattern,
giving forensic visibility into EGF pearl state each epoch.
gate1/gate2 sigmoid outputs are intentionally omitted: recomputing them
host-side would violate feedback_no_cpu_compute_strict; the sigmoid
inputs are sufficient for a reader to infer the output values.
docs/isv-slots.md updated (Invariant 7): records B.12 HEALTH_DIAG wire-up.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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