Filter to active items only, remove Status column, document widget binding rules

- Add WHERE item_active filter to show only active unused items
- Remove Status column from query and table widget
- Add widget binding guidance to AGENTS.md (NUMBER inputs
  cannot use NULLIF pattern due to prepared statement typing)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pages/Operations - Unused Items/queries/unused_items/unused_items.txt

@@ -12,7 +12,6 @@ SELECT
         WHEN 'F' THEN 'Phantom'
         ELSE i.item_type
     END AS "Item Type",
-    CASE WHEN i.item_active THEN 'Active' ELSE 'Inactive' END AS "Status",
     cc.comment_user AS "Created By",
     COALESCE(i.item_created, cc.comment_date)::date AS "Date Created",
     last_txn.last_transaction_date::date AS "Last Transaction",
@@ -30,6 +29,7 @@ LEFT JOIN (
     JOIN invhist ih ON ih.invhist_itemsite_id = isite.itemsite_id
     GROUP BY isite.itemsite_item_id
 ) last_txn ON last_txn.itemsite_item_id = i.item_id
-WHERE (CURRENT_DATE - COALESCE(last_txn.last_transaction_date, i.item_created, cc.comment_date)::date)
+WHERE i.item_active
+  AND (CURRENT_DATE - COALESCE(last_txn.last_transaction_date, i.item_created, cc.comment_date)::date)
       >= '{{UnusedDays.text}}'::int
 ORDER BY "Days Unused" DESC