[bflatastic]

Guides dragged out of the rulers now snap like moved guides, and guides can belong to one artboard (parts a–c of #451; part d is still open).

• Snapping (a, b): A guide dragged out of a ruler used to snap only with Shift, to the ruler's ticks. The drag now goes through the engine: Session::ruler_guide drives a NewGuide that previews guide.add, and the result is one undo step. With Smart Guides on, it lands on the edges, centres (which covers the sides' midpoints) and anchors of the art, and on the artboards' edges and centres, with a label. With Smart Guides off, View › Snap to Point pulls new and moved guides onto anchors. Shared GuideSnap in rulerguide.rs, Targets::anchors_only.
• Moving art (b): with Smart Guides on, art moved with the Selection tool already snapped flush to artboard edges and centres on main. A new test now covers it.
• Artboard guides (c): Guide.artboard holds an artboard id. The field is written only when set, so canvas guides save as before and older files open unchanged. guide.add {artboard?: index} makes one and guide.list reports artboard. A guide dragged out of a ruler while the Artboard tool is active belongs to the active artboard (Illustrator's rule). An artboard guide is drawn, picked and snapped to (Snap to Point) only across its artboard. It moves with the artboard (artboard.move, a pure move in artboard.setProps, artboard.rearrange), is copied with it (artboard.duplicate, Alt-drag copy) and is deleted with it (artboard.delete, artboard.cut); the guide selection stays in step through Document::retain_guides. SVG/PDF export is unchanged, since ruler guides aren't exported.
• Not done (d): ruler guides as Layers rows with their own lock and hide. Ruler guides aren't layer nodes, and making them nodes would break their non-printing, not-selectable-as-art semantics. Lock Guides already locks them all (since Fix #414: select, move and delete ruler guides with the selection tools #415), and Make Guides paths are already <Guide> rows in Layers. This is listed in the ROADMAP parity row.
• Docs: docs/mcp.md (Ruler guides); ROADMAP (Last updated, Drawing aids, parity row 80→82 %).

Parity: Smart Guides' alignment guides follow "the center and edges of geometric objects, artboard, and bleeds" (Smart Guides options). To keep a guide to one artboard, "select the Artboard tool and drag the guides onto the artboard" (Adobe Learn: use ruler guides, community); such a guide moves with its artboard.

Checks

• Rebased on 5f9d280892ca38a06332a36deed711152d75f6f1.
• New tests fail on main. canvas::tests::guides_from_the_rulers_snap_and_artboard_guides_span_their_artboard was checked against the old ruler code and got [(true, 201.7), (false, 298.3)] instead of [(true, 200.0), (false, 300.0)]. Also new: rulerguide::tests::{a_new_guide_snaps_to_the_art_and_the_artboard, a_new_guide_is_made_on_release_over_the_canvas_only, with_smart_guides_off_snap_to_point_pulls_guides_onto_anchors, an_artboard_guide_is_picked_and_snapped_to_across_its_artboard_only}, tests_menucmds::{artboard_guides_go_with_their_artboard, guides_dragged_out_of_a_ruler_snap_and_take_the_artboard_tool_s_artboard, moved_art_snaps_to_the_artboard_edges_and_centre}, native_v3::artboard_guides_round_trip_and_canvas_guides_save_as_before.
• cargo fmt --all; cargo clippy -p vectorcraft-{doc,tools,engine,ui-egui,format} --all-targets -- -D warnings clean; cargo test on those crates: 2498 passed, 0 failed (includes the i18n message-catalog check: no new strings).
• cargo xtask layers, cargo xtask brands and cargo xtask wasm pass; cargo check for x86_64-unknown-linux-gnu and aarch64-apple-darwin passes.
• MCP stdio smoke (vectorcraft-cli mcp) passed. guide.add {artboard: 1} followed by artboard.move {dx: 25} gave guide.list → pos 625 with artboard: 1. A bad artboard returns "no such artboard". artboard.delete takes its guide and leaves the canvas guide.

🤖 Generated with Claude Code

[bflatastic]

Full cargo xtask ci passed on the integrated stack; merging.