Keep the control-choosing rule where a caller picks one

AGENTS.md

@@ -259,10 +259,6 @@ Revisit only if the stated reason stops holding.
   it means disclosure rather than popup: the nav tree. `shell.ejs` hand-rolls the same block for the
   profile menu (its trigger composes escaped user values and its one item is a CSRF POST form) — keep
   the two in step.
-- **Two multi-selects, chosen by list length.** `chips` lays every option on the bar, which is right
-  for a handful and a wall past that — `multiselect` hides the same checkboxes in a popover and puts
-  the chosen count on the trigger. Both submit the same repeated parameter, so swapping one for the
-  other is a view-model edit.
 - **`ICON_NAMES` (`src/ui/icons.ts`) is a host-owned registry, not a frozen plugin contract**, so it
   is deliberately not re-exported from `@plainpages/plugin-api`. The palette may narrow when the last reference
   to an id goes, and a plugin needing one gets it re-registered in the same change. Accepted cost: an

views/partials/filter-bar.ejs

@@ -9,6 +9,8 @@
     chips       { name, legend?, value?:string[], options:{value,label}[] }    (checkboxes)
     multiselect { name, legend?, note?, value?:string[], options:{value,label}[] }  (checkboxes in a popover)
     daterange   { legend?, from:{name,value?,label?}, to:{name,value?,label?} }
+  chips and multiselect are the same checkboxes on the same parameter: on the bar, or behind a
+  button once the list is too long to lay there.
   The form is a GET, which replaces the whole query string — so the visitor's chosen language rides
   along as a hidden input, and every href here (pills, clear) is run through localeHref.
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