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fix(signals): rc.6 P1 store sweep — stale parent-slot keys, family-map privatization clones, deep() overlay re-walk (#3282, #3283, #3284)

Three fold-machinery gaps reported by brenelz, all predating the #3271 fix:

- #3282: fold-time parent-slot writes resolve the slot by raw identity —
  the wrap-time pk goes stale when arrays move, and an edited moved row
  folded onto a sibling's slot (privatization stitch wrote unguarded; the
  drainFolds/eager-fold CAS twins orphaned silently).
- #3283: deep()'s trap-bypassing walk enumerates overlay pending backings
  with the #3044 committed-keys merge instead of bare ownKeys, so a
  mid-flush re-walk no longer drops untouched children from the effect's
  dependency set.
- #3284: privatizeCommitted registers its clone in the target's own
  registration map (fam.map for families) instead of only the global
  lookup, preserving proxy identity and ancestor observers in derived
  stores.

Size: createStore 14.29 -> 14.35 KB, store-family app 26.37 -> 26.42 KB
(audit notes in .size-limit.js). Floors unaffected.

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

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