eval visualization: vidx <-> num mappings; helpers to move from logical nums -> rows, feed through windowed row production path

src/eval/eval_core.h

@@ -93,7 +93,7 @@ typedef U64 E_SpaceKind;
 enum
 {
   E_SpaceKind_Null,
-  E_SpaceKind_FileSystem,
+  E_SpaceKind_HashStoreKey,
   E_SpaceKind_FirstUserDefined,
 };
 

src/eval/eval_ir.c

@@ -1282,7 +1282,7 @@ e_irtree_and_type_from_expr__space(Arena *arena, E_Space *current_space, E_Expr
     case E_ExprKind_LeafFilePath:
     {
       U128 key = fs_key_from_path_range(expr->string, r1u64(0, max_U64));
-      E_Space space = {E_SpaceKind_FileSystem, .u128 = key};
+      E_Space space = {E_SpaceKind_HashStoreKey, .u128 = key};
       U64 size = fs_size_from_path(expr->string);
       E_IRNode *base_offset = e_irtree_const_u(arena, 0);
       E_IRNode *set_space = e_irtree_set_space(arena, space, base_offset);