docs(mirror): record #4746 Item A batch 4 (#4754) and correct the stale Concrete directory size

[phasetr]

Part of #4746.

Syncs .self-local/issues/4746.md with the merged state of Item A batch 4 (PR #4754,
main ee981926) and repairs one stale figure the mirror carried.

• New section recording batch 4: 9 modules / 31 declarations / 712 lines deleted, the
  same-commit docs/index.md + tex/proof-guide.tex retraction (four re-measured
  wrapper counts, the nested-brace label split, the one family label that lost all its
  members, 12 in-library doc comments), the two-sweep condition (v) result (7 verdict
  moves, all protective, 0 violations), and every gate re-measured on the merged
  main.
• Ratchet: the floors were not lowered by batch 4. The mirror's F1 table is updated
  to the measured slack 27 / 27 / 37, and the F1 note's Concrete, 869 figure is
  corrected to 851 — 869 predated PR refactor: delete 10 zero-consumer Mayer/vd-polymer wrapper modules (safe-to-delete batch 3) #4751's ten-module deletion (859 at
  fd7a2a71). The same stale figure was fixed in scripts/test_audit_gate.py inside
  refactor: delete 9 zero-consumer partition/free-energy, magnetization/Mayer and J = 0 pseudo-mass wrapper modules (safe-to-delete batch 4) #4754.
• Remaining scope re-derived on the merged main: 23 modules left on the tier-2 tracked
  list; freshly measured population 199 fully dead raw / 194 excluding Lemma_17_5_2 /
  146 lane-eligible (157 before: 9 deleted here plus 2 that left the set because
  this PR's documentation retraction protected their declarations).
• Records that the three scanner fail-open constructs are already filed as a child item
  of Item A.

.self-local/ only; no library, docs, tex or script change.

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