M4: reverse page order (organize.reverse-pages) (#1720)

Organize pages ▸ More ▸ Reverse pages (and the command palette) reverses
the selected pages among their own positions, or the whole document when
fewer than two pages are selected. It is one undoable step, needs the
assemble permission like the other page edits, and is available headless
as the page_reverse automation tool (pages optional, default all).

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

parity/acrobat-features.toml

@@ -2833,11 +2833,11 @@ title = "Reverse page order"
 area = "D"
 tier = "P2"
 milestone = "M4"
-status = "planned"
-commands = []
-tools = []
-evidence = []
-notes = ""
+status = "shipped"
+commands = ["page.reverse"]
+tools = ["page_reverse"]
+evidence = ["crates/organize/src/tests.rs::reverse_pages_reorders", "crates/organize/src/tests.rs::cannot_reverse_missing_or_fewer_than_two_pages", "crates/automation/tests/automation.rs::reversing_pages_through_tools", "crates/ui-egui/tests/editing.rs::reverse_pages_reverses_the_selection_or_else_the_whole_document"]
+notes = "Organize Pages ▸ More ▸ Reverse pages, or the command palette: two or more selected pages swap among their own positions, otherwise the whole document reverses. One undo step. Not yet: an entry in the page thumbnails' right-click menu"
 
 [[feature]]
 id = "organize.cut-copy-paste-pages"