fc1700ea

docs: rank n+2 limitations from the final review's findings 5, 6 and the layout outlier

Generic binary64 conditioning on light-like lanes (8 rational references
against the fast engine's 25), over-declared rank in the fast engine, and
the syn-n2-r2 width-1 code-placement slowdown: each documented with what
would fix it and why it is more than a local change.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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