docs(gl): define ledger architecture and invariants

2026-08-14 18:45:02 +03:30
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 # GL

+Darano's independent, append-only general-ledger service. It preserves every
+committed wallet value movement so financial state can be reconstructed when a
+blockchain or provider is unavailable.
+
+The implementation contract and invariants are defined in [DESIGN.md](DESIGN.md).