docs(history): OtOpcUa TwinCAT native array subscriptions (2026-10-07)

.claude/skills/sister-project-history/otopcua.md

@@ -28,3 +28,10 @@ AddRoute of the dev Mac (`oee-tagdump-mac`, `10.181.206.245.1.1`) on the two tes
   module I/O paths (`Local:1:I.Data`) accepted; unknown tag no longer throttles its whole device (`BadNodeIdUnknown`/`BadTimeout`);
   user-string arrays; width-vs-authored-type mismatch → `BadTypeMismatch`. Residual: same-width wrong type undetectable (libplctag
   discards the reply type code).
+- **TwinCAT native array subscriptions** (same day, merge `f3e92fec`): array tags now subscribe natively — one ADS notification for the
+  whole array, sized by the resolved data type and decoded from raw bytes by the same `TwinCATArrayCodec` the poll read now uses (the
+  lib's typed array read failed live for `ARRAY OF TIME`, multi-dim and TC2 member arrays). Multi-dim flattened in PLC order; a shorter
+  authored `arrayLength` reads the first N; element/length/struct mismatches → `BadTypeMismatch` per tag; native arrays capped at
+  128 KiB (`BadOutOfRange` beyond; poll uncapped). Supersedes the `UseNativeNotifications=false`-for-arrays workaround above. Also fixed:
+  bit-indexed BOOL notifications register on the parent word (the `WORD.N` path failed the whole subscribe call). Live-gated read-only
+  on Z33856/Z33733 — native == poll for every array incl. changing, multi-dim, STRING(80) and a 131,072 B array.