r510 keep the page-directory discovery attempts for coherent evidence: a large mixed-space map no longer burns them

r508/r509 witness: 'page directory discovery: not found (base=0x0 ap=ram
cands=39621 best=0/8)' during the very first client - eight RAM walks
spent on a stride subsample of the boot-scoped map, which holds pairs from
several VA spaces and (per the code's own comment) no single directory
reproduces. By the time the push-buffer pairs - the strongest samples -
formed, the attempts budget was gone; every later client's high argument
pointers stayed unresolvable and the boot ended in the held-launch class.
Only a small map (one session's own pairs) still falls back; a larger one
waits for the pairs and keeps the attempts.

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