Reworks the board further

hardware/re-bba-rb/TODO.md

@@ -358,8 +358,11 @@ Major work this session:
 
 ## Minor / BOM
 
-- [ ] **U7 EEPROM undersized — swap 93LC46B → 93LC56B for V2 (found at bring-up
-      2026-08-22).** The 93LC46B is 128 B; the FT2232H needs ≥256 B (93LC56B /
+- [x] **U7 EEPROM undersized — swap 93LC46B → 93LC56B — DONE (schematic,
+      2026-08-25):** U7 now 93LC56B, MPN 93LC56BT-I/SN, LCSC **C6164**, same
+      SOIC-8 footprint. 256 B is the FT2232H's full EEPROM size (confirmed:
+      pyftdi `EXT_EEPROM_SIZES=(128,256)`, `max_eeprom_size=256`), so this fully
+      resolves the soft-brick. Found at bring-up 2026-08-22. The 93LC46B is 128 B; the FT2232H needs ≥256 B (93LC56B /
       93LC66B) to hold its config, so the "re-BBA-rb" USB product string can't be
       programmed on V1. **⚠️ Worse than cosmetic: ATTEMPTING the write SOFT-BRICKS
       the FT2232H** — the partial/mirrored write leaves a checksum-valid-garbage