feat(viz): graph_layouts (radial/hierarchical/fixed) + viewport multi-select+lasso (issue 0049i)
Phase 1 — graph_layouts:
- New module cpp/functions/viz/graph_layouts.{h,cpp,md} v1.0.0
- layout_grid, layout_circular, layout_random (migrated from graph_force_layout.cpp)
- layout_radial: BFS rings from root, hop k -> circle of radius k*ring_spacing
- layout_hierarchical: Sugiyama-style heuristic (longest-path levels + barycenter ordering)
- layout_fixed: no-op
- All respect NF_PINNED. graph_layout_circular/grid kept as deprecated wrappers.
Phase 2-3 — graph_viewport v1.2.0:
- Multi-selection via state.selection (vector<int>); NF_SELECTED kept in sync
- Lasso: Shift+Drag on empty area; AABB hit-test on release
- Drag of N-selection: all selected pinned + moved by mouse delta
- Ctrl+click toggle, Esc clears selection
- Right-click on node -> on_context_menu callback
- Double-click on node -> on_double_click callback
- Helpers exposed: graph_viewport_clear/add_to/toggle/is_selected (own TU for tests)
Phase 4 — tests:
- test_graph_layouts: 12 cases / 364 assertions covering geometry, pin, edges
- test_graph_viewport: 5 cases for selection helpers (pure logic, no GL)
Phase 5 — demo (primitives_gallery):
- Layout combo (force/grid/circular/radial/hierarchical/fixed) + Apply button
- Right-click popup with Pin/Unpin/Add-to-selection
- Status overlay shows [N selected] when selection non-empty
- Updated golden images
Issue moved to dev/issues/completed/.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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