feat: add get_schematic_view tool for rasterized schematic images

Exports schematic to SVG via kicad-cli, then converts to PNG using
cairosvg (same approach as get_board_2d_view). Falls back gracefully
to SVG if cairosvg is not installed. Supports configurable output
size and format (png/svg).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/tools/registry.ts

@@ -103,6 +103,7 @@ export const toolCategories: ToolCategory[] = [
       "list_schematic_labels",
       "generate_netlist",
       "sync_schematic_to_board",
+      "get_schematic_view",
       "export_schematic_svg",
       "export_schematic_pdf"
     ]