feat: records with designator lvalues, and pointer types (CIE 4.1/4.2)

- New CodeGen::emitLValue resolves any designator — variable, checked
  array element, record field chain (CreateStructGEP via the record
  payload), pointer deref (with the null-pointer [Fatal] check) — to an
  address + type name; loadFromLValue centralizes the rvalue read and the
  STRING null->"" guard, so zero-initialized STRING fields read as "".
- Designator assignment stores through emitLValue + emitCoercedExpr;
  whole-record copies (r2 <- r1, array elements, BYVAL args, RETURN) are
  aggregate loads/stores with name-checked admission.
- getExprTypeInfo walks designator chains statically (field types from
  the record payload, deref to the pointee), so records/pointers type
  correctly in every expression context.
- Address-of ^x admits into a pointer target only when the designator's
  type name equals the declared pointee exactly (nominal, strict: the
  guide's own ^INTEGER-at-a-Season example is a compile error by design);
  ^arr[i] and ^rec.field work through the same lvalue path.
- Verified: the guide's §4.2 StudentRecord example (minus DATE), nested
  records, arrays of records with Form[i].YearGroup writes, record
  BYREF/BYVAL params, NodePtr = ^Node forward reference with writes
  through n1.Next^.Data, unset-pointer deref dying with [Fatal].

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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