[foxnne]

Maintainer request (PM worker). Stacked on #673 (base layout/tabs-when-many); retarget to main once that merges.

What changes

The menu that drops from a place's arrange button (#634, region.arrange:<name>) now has only icon controls in its header, on the same row as the place's name:

Control	Icon	Command
Split right	columns-2	layout.place.splitRight
Split down	rows-2	layout.place.splitDown
Clear the view	eraser	layout.place.clear
Reset to the layout's default for this place	rotate-ccw	layout.place.reset
Delete (was "Remove")	trash-2, in the theme's error colour	layout.place.delete

• Each control has a tooltip, and pressing it runs its command.
• Each command takes an optional place. Without one it acts on the place whose menu is open. This is how the palette, a keymap, a tape or an agent reach the controls (app/layout/place_commands.zig, a pseudo-plugin layout, registered beside fizzy's own commands).
• A command only asks. It joins a small queue (Picker.requests, carried out in order in the next draw, where the live Layout is), so a command run outside a frame (a control-server call) works too.
• Whether each control applies is one rule: Picker.applies, which is allows plus whether the place shows anything, for Clear. The commands refuse with the command's title when allows says no. The buttons dim. A request that no longer applies when it runs, or a split of a place too small to split, is logged.
• The commands' owner is Picker.commands_owner, so each layout state's commands reach their own.
• Split and delete shut the menu.
• The Split submenu and the text buttons are gone.
• Anchors: region.menu.split-right:<place>, split-down, clear, reset, delete, each published only while it can be pressed. They replace picker.action:* and picker.split:*.
• The tour now presses region.menu.split-down:Sidebar.
• docs/AUTOMATION.md lists the new anchors and tabs:<place>, and drops the Single/Multiple and Split-menu rows.

SDK impact

• None (the fingerprint move is layout: a place shows tabs only while it holds more than one view #673's)
• Core-only or additive: reaches plugins at the next SDK release
• Fingerprint moved: recorded in sdk/src/version.zig, sdk_version untouched, PR labelled sdk
• SDK release: bumps sdk_version, lists the sdk PRs since the last sdk-v* tag

Verified

• macOS: zig build, test, test-integration (incl. the tour and every bundled demo; 81/81 steps, 314/314), check-web, test-sdk-version, check-tests-reached, check-fmt.
  • New tests: the header anchors are published only while their control applies. The commands run from the palette with no place named, by the button (a real click on region.menu.reset:Panel), and by callCommand with a place (split; the menu shuts).
  • One quiet sandbox look (--quiet, own profile, a tape opening Main's menu): Main holding one view has no app strip, and Panel holding Output and Devtools has one. The header row reads name, then split right, split down, clear, reset (dimmed) and delete (dimmed red), with the Split Right tooltip up.
• Windows:
• Linux: CI
• Web: check-web

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