Split the object inspector, and sweep out the section banners

objectSection.ts had grown to 559 lines around three separable parts: the
queries, the vector rows and the parent row. Four object commands repeated the
same capture/restore preamble – applyCommands stays out, its five carry extra
undo state whose restore order matters.

58 dashed banner comments are gone. The nine labels in nodes/index.ts stay:
they are the only structure a flat 90-entry array has.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/core/graph/nodes/shared.ts

@@ -3,8 +3,6 @@ import type { PropertyDef } from '../../properties/PropertySchema';
 import type { NodeDef, PortDef } from '../NodeRegistry';
 import { asBoolean, asNumber } from '../values';
 
-// --- ports -----------------------------------------------------------------------------------
-
 export const exec = (key = 'exec', label = ''): PortDef => ({ key, label, type: 'exec' });
 export const num = (key: string, label = key): PortDef => ({ key, label, type: 'number' });
 export const bool = (key: string, label = key): PortDef => ({ key, label, type: 'boolean' });
@@ -23,8 +21,6 @@ export const collisionOutputs = (): PortDef[] => [
   obj('collider'),
 ];
 
-// --- params ----------------------------------------------------------------------------------
-
 export const keyParam: PropertyDef = { key: 'key', label: 'Key', kind: 'key', default: 'ArrowRight' };
 
 /** Options are empty on purpose: the graph inspector fills in the behavior's variables. */
@@ -39,8 +35,6 @@ export const variableParam: PropertyDef = {
 /** No `assetTypes`: any placeable asset is a valid answer here. */
 export const assetParam: PropertyDef = { key: 'asset', label: 'Asset', kind: 'asset', default: '' };
 
-// --- node factories --------------------------------------------------------------------------
-
 export function binaryMath(type: string, description: string, fn: (a: number, b: number) => number): NodeDef {
   return {
     type,