Plan drags and scrolls with Jev

[brynary]

Stacked on #26. With --jev, drags and scrolls went to the model; now Jev plans them.

Change

Action	How Jev plans it
Drag	Picks the element to drag from every named element, then where to drop it: first from the parts of the page that take a drop (regions, lists, dialogs, frames, and similar), then from every named element, never the dragged element or anything inside it.
Scroll	The first request asks two more questions: which way (down, up, left, right, to a position, into view), and whether the whole page or a part of it scrolls. The page scrolls through the snapshot's root element; Jev picks the part, from the same candidates as a drop, or the element to bring into view.
Position	Read from the instruction's words: 50%, 75 percent, 0.75, halfway, the top, or the bottom. Without one, or with two that differ, the model plans.

Any unsure answer leaves the step to the model, as before.

Evals

Both jev: variants, all 54 local tasks, three runs each. Summary: evals/act/results/2026-09-27-local-jev.md.

	pass	by Jev	p50 ACT	p90 ACT	$/task
Jev + Flash-Lite, #23 (48 tasks)	1.00	0.84	0.47s	1.13s	$0.0004
Jev + Flash-Lite, this PR	1.00	0.83	0.5s	1.2s	$0.0005
Jev + Luna, #23 (48 tasks)	1.00	0.83	0.47s	1.79s	$0.0002
Jev + Luna, this PR	1.00	0.83	0.5s	2.3s	$0.0003

The two extra intent questions change nothing on the older tasks. On the six pointer tasks, Jev now chooses 31 of 36 actions, up from 6 (right clicks only):

task	by Jev	line
right-click-menu	6/6	RIGHTCLICK role:listitem
kanban-move	6/6	DRAG role:article to role:region "Done"
scroll-halfway	6/6	SCROLL to 50%
scroll-back-up	6/6	SCROLL up
scroll-panel-chunk	6/6	SCROLL role:dialog "All filters" down
scroll-in-frame	1/6	SCROLL role:iframe to 50%

In scroll-in-frame the iframe has no name in the snapshot (its title does not show), so Jev is unsure it is "the incident history" and the model plans the step. All runs pass.

Tests

• ACT: Jev drags with three requests and no model call; an unsure drag goes to the model; Jev scrolls the page to the position the instruction names with one request; an unsure scroll goes to the model.
• Unit: position reading, the scroll intent, the container view, the root, and containment.
• mise run check passes. SPEC §7.4 and the CHANGELOG describe the change.

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