eval/eval-viz: pull out rules for mapping exprs/irtrees -> lookup/expansion rules; use this path in the single-line value string generator; eliminate old non-view-rulified string generation paths

src/eval_visualization/eval_visualization_core.h

@@ -128,6 +128,16 @@ struct EV_ViewRuleInfoTable
   U64 slots_count;
 };
 
+////////////////////////////////
+//~ rjf: Expansion Rule Types
+
+typedef struct EV_ExpandRuleTagPair EV_ExpandRuleTagPair;
+struct EV_ExpandRuleTagPair
+{
+  EV_ViewRuleInfo *rule;
+  E_Expr *tag;
+};
+
 ////////////////////////////////
 //~ rjf: Blocks
 
@@ -368,4 +378,9 @@ internal String8 ev_string_from_hresult_code(U32 code);
 internal String8 ev_string_from_simple_typed_eval(Arena *arena, EV_StringFlags flags, U32 radix, U32 min_digits, E_Eval eval);
 internal String8 ev_escaped_from_raw_string(Arena *arena, String8 raw);
 
+////////////////////////////////
+//~ rjf: Expression & IR-Tree => Expand Rule
+
+internal EV_ExpandRuleTagPair ev_expand_rule_tag_pair_from_expr_irtree(E_Expr *expr, E_IRTreeAndType *irtree);
+
 #endif // EVAL_VISUALIZATION_CORE_H