Auto: s7-d1 — TIA Portal CSV + STEP 7 Classic AWL symbol import

Closes #299

tests/ZB.MOM.WW.OtOpcUa.Driver.S7.IntegrationTests/Fixtures/sample_step7_classic.awl

@@ -0,0 +1,25 @@
+(* Sample STEP 7 Classic AWL file — PR-S7-D1 / #299 fixture.
+   Carries a VAR_GLOBAL block (M-area sequential offsets) and a
+   DATA_BLOCK (DB1, sequential DBW/DBD offsets). Comments stripped
+   before declaration parsing so this preamble does not affect counts.
+*)
+
+VAR_GLOBAL
+  // M-area globals — assigned sequentially: MW0, MW2, MD4
+  Speed : INT;       // motor speed setpoint
+  Pressure : INT;    // pressure transducer
+  ActualValue : REAL;
+END_VAR
+
+DATA_BLOCK DB1
+  TITLE = 'Sample DB'
+  VERSION : 0.1
+  STRUCT
+    CycleCount : INT;            (* runtime cycle counter *)
+    Setpoint : REAL := 50.0;     (* setpoint with init *)
+    ActualValue : REAL;
+    RunFlag : BOOL;
+    Recipe : STRING[20];
+  END_STRUCT;
+BEGIN
+END_DATA_BLOCK