Record whole-engine sd10 results: zero solve regression, +8.38% NPS

Board-representation migration section 4 item 5 / section 5 item 2 /
section 7: ran all three curated suites (ecm_ringers,
ecm_confident_quick, ecm_hard_quick) at sd10, same commit built twice
(default asm GetAttacks vs. GETATTACKS_BITBOARD=1), rather than against
the checked-in head_reference/ binary -- that binary predates this
branch's sections 1-6 by a dozen-plus unrelated commits, so diffing
against it would have conflated this change with everything else on
the branch. Isolating the single variable (same commit, one flag
flipped) is the correct comparison here.

Results: solve counts bit-identical on all three suites (10/11, 83/90,
25/90) -- zero regression. Node counts up slightly (+0.36% to +1.24%),
the expected "same attacker set, not necessarily same order" effect on
move-ordering tie-breaking already flagged in this document; didn't
cost a single solve. Aggregate (total nodes / total script time across
all three suites): +8.38% wall-clock NPS (1,164,842 -> 1,262,490),
comfortably absorbing the extra nodes -- confirms section 3's isolated
cycles/call benchmark reflects a real end-to-end win, not an artifact
of the isolated harness.

match_play.py (the remaining section 7 criterion) deliberately
deferred, not run this pass.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Jntky4yGUTyQVaGCXms4F2

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