Add freeform No-Field and auction facts

docs/RULE_DECISIONS.md

@@ -1,5 +1,12 @@
 # Rule decision index
 
+## Freeform No-Field and auction knowledge — 29 October 2026
+
+Bounded questions about a concealed marker and actual current auction knowledge
+map to existing checked facts, including supported compound expressions. This
+grammar is a provisional online interpretation.
+[Scope](TRUTHTRANCE_KNOWLEDGE.md#freeform-no-field-and-auction-knowledge--29-october-2026).
+
 ## Compound freeform Truthtrance facts — 29 October 2026
 
 Bounded single-operator freeform expressions compose the existing checked