Integration: find.find and find.next accept find.change's keys

The Find/Change dialog and main's find-scope tests send one parameter set
(with change, first, attrs) to Find, Find Next and Change. next's strict
parameter check refused those keys on find.find and find.next, so Find
failed in the dialog. The two commands now name the keys as ignored.

crates/engine/src/cmd/find.rs

@@ -61,7 +61,7 @@ pub fn specs() -> Vec<CommandSpec> {
             }
         ),
         cmd!(query "find.find", "Find", ["Edit", "Find/Change"], None,
-            "{find, grep?: bool, caseSensitive?: bool, wholeWord?: bool, scope?: document|story|selection, story?} → matches [{story, start, end, text}]",
+            "{find, grep?: bool, caseSensitive?: bool, wholeWord?: bool, scope?: document|story|selection, story?, change?|first?|attrs?: ignored (find.change takes them; one request serves all three Find/Change commands)} → matches [{story, start, end, text}]",
             has_doc, find),
         cmd!(
             "find.change",
@@ -72,7 +72,7 @@ pub fn specs() -> Vec<CommandSpec> {
             has_doc,
             change
         ),
-        cmd!(noundo "find.next", "Find Next", ["Edit"], Some("Cmd+Alt+F"), "{find, grep?, caseSensitive?, wholeWord?, scope?: document|story|selection, story?} — Selection starts at its original beginning; later calls advance within the scope", has_doc, find_next),
+        cmd!(noundo "find.next", "Find Next", ["Edit"], Some("Cmd+Alt+F"), "{find, grep?, caseSensitive?, wholeWord?, scope?: document|story|selection, story?, change?|first?|attrs?: ignored (find.change takes them; one request serves all three Find/Change commands)} — Selection starts at its original beginning; later calls advance within the scope", has_doc, find_next),
     ]
 }