🚧 Change module numbering

README.md

@@ -22,9 +22,11 @@ a virtual node whose I/O behavior is driven by scripted scenarios.
   pulses, waits, and PASS/FAIL assertions with timeouts; state machines
   and Python action plugins for complex plant models.
 - **Two I/O addressing schemes** for aliases: *module-based* —
-  `{ type: di, module: 2, channel: 1 }` = `DI2.1` (module slot and
-  channel both 0-based) — and *pool-based* — `{ type: di, channel: 3 }`
-  (1-based index across the node's DI pool). Both may be mixed.
+  `{ type: di, module: 2, channel: 1 }` = `DI2.1` (module **numbered
+  0-based within its type** — `DI0`, `DO0`, `AI0`, `AO0` start each
+  kind — and channel 0-based; v1.5) — and *pool-based* —
+  `{ type: di, channel: 3 }` (1-based index across the node's DI
+  pool). Both may be mixed.
 - **Bench mode** *(requested, planned — spec §9)*: run the simulator
   without a scenario (`wago-sim serve --node ...` already works);
   planned additions: `--set DI0.1=ON` startup seeding, an interactive