sp7(state): T2 polish — descriptions reflect current state vs future T6/T7

Rewrite the three sp5_budget_c51/cql/ens registry descriptions to be
accurate at HEAD aa2854017: replace present-tense "driven by"/"no longer
writes" with future-tense "will be driven by"/"will stop writing", replace
non-existent C51_BOOTSTRAP_BUDGET/CQL_BOOTSTRAP_BUDGET/ENS_BOOTSTRAP_BUDGET
named constants with their actual anonymous .max() literal line references,
and apply the "(Pearl 2 will stop writing...)" parenthetical uniformly to all
three slots (cql was missing it). Audit doc T2 bullet updated accordingly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/dqn-wire-up-audit.md

@@ -3884,6 +3884,7 @@ extended. No producer kernel yet — that arrives in the next commit.
 - T2 (commit ⟨pending⟩): 4 SP7 ResetEntries + corrected `sp5_budget_cql`
   description (was claiming a non-existent "regime_stability allocator")
   + clarified `sp5_budget_c51`/`sp5_budget_ens` to reflect SP7 ownership.
+  T2 polish landed (commit pending) — registry descriptions corrected to reflect current state vs T6/T7 future changes.
 - T3: kernel `.cu` file.
 - T4: build.rs cubin manifest.
 - T5: trainer struct + launcher fn.