feat(schematic): reposition and auto-place Ref/Value field labels

Adds field-placement tools:
- set_schematic_property_position / batch_set_schematic_property_positions:
  move a symbol's Reference/Value field labels
- autoplace_schematic_fields: place every symbol's fields clear of its body
  and nearby net labels (the #1 readability problem in generated schematics)
- check_schematic_layout: audit out-of-bounds / fields-in-body / duplicate
  labels (note: overlaps upstream find_overlapping_elements etc. — reuse or
  drop on request)

Generic .kicad_sch text helpers are factored into commands/schematic_text_utils.py
so the batch/hierarchy modules don't import from one another.

- python/commands/schematic_text_utils.py: shared text/S-expr helpers
- python/commands/schematic_field_layout.py: SchematicFieldLayoutCommands
- src/tools/schematic-layout.ts + registry 'schematic_layout' category
- python/kicad_interface.py: import + instantiate + dispatch routes
- tests/test_schematic_field_layout.py: 23 unit tests incl. end-to-end on real .kicad_sch

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/server.ts

@@ -21,6 +21,7 @@ import { registerSchematicTools } from "./tools/schematic.js";
 import { registerLibraryTools } from "./tools/library.js";
 import { registerSymbolLibraryTools } from "./tools/library-symbol.js";
 import { registerSchematicHierarchyTools } from "./tools/schematic-hierarchy.js";
+import { registerSchematicLayoutTools } from "./tools/schematic-layout.js";
 import { registerJLCPCBApiTools } from "./tools/jlcpcb-api.js";
 import { registerDatasheetTools } from "./tools/datasheet.js";
 import { registerFootprintTools } from "./tools/footprint.js";
@@ -298,6 +299,7 @@ export class KiCADMcpServer {
     registerLibraryTools(this.server, this.callKicadScript.bind(this));
     registerSymbolLibraryTools(this.server, this.callKicadScript.bind(this));
     registerSchematicHierarchyTools(this.server, this.callKicadScript.bind(this));
+    registerSchematicLayoutTools(this.server, this.callKicadScript.bind(this));
     registerJLCPCBApiTools(this.server, this.callKicadScript.bind(this));
     registerDatasheetTools(this.server, this.callKicadScript.bind(this));
     registerFootprintTools(this.server, this.callKicadScript.bind(this));