feat(logic): array local init + sizing enforcement in localstate

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

web/src/lib/localstate.ts

@@ -11,9 +11,15 @@
 
 import { writable, type Readable, type Writable } from './store';
 import type { SignalValue, SignalMeta, StateVar } from './types';
+import { parseInitialArray, applySizing, type ArrVal } from './arraypolicy';
 
 const valueStores = new Map<string, Writable<SignalValue>>();
 const metaStores = new Map<string, Writable<SignalMeta | null>>();
+const decls = new Map<string, StateVar>();
+
+export function declaredVar(name: string): StateVar | undefined {
+  return decls.get(name);
+}
 
 const DEFAULT_VALUE: SignalValue = { value: null, quality: 'unknown', ts: null };
 
@@ -42,6 +48,8 @@ function coerce(v: StateVar): any {
       return v.initial === 'true' || v.initial === '1';
     case 'string':
       return v.initial;
+    case 'array':
+      return parseInitialArray(v);
     default: {
       const n = parseFloat(v.initial);
       return isNaN(n) ? 0 : n;
@@ -53,6 +61,7 @@ function coerce(v: StateVar): any {
 // publishes metadata. Call this whenever a panel is loaded.
 export function initLocalState(vars: StateVar[] | undefined): void {
   for (const v of vars ?? []) {
+    decls.set(v.name, v);
     valueW(v.name).set({
       value: coerce(v),
       quality: 'good',
@@ -64,6 +73,9 @@ export function initLocalState(vars: StateVar[] | undefined): void {
       displayLow: v.low ?? 0,
       displayHigh: v.high ?? 100,
       writable: true,
+      elem: v.elem,
+      sizing: v.sizing,
+      capacity: v.capacity,
     });
   }
 }
@@ -77,6 +89,11 @@ export function getLocalMetaStore(name: string): Readable<SignalMeta | null> {
 }
 
 // writeLocalState updates a local variable's live value in place.
+// When the declared variable is an array type, the written value is passed
+// through applySizing to enforce the declared sizing policy.
 export function writeLocalState(name: string, value: any): void {
-  valueW(name).set({ value, quality: 'good', ts: new Date().toISOString() });
+  const sv = decls.get(name);
+  let v = value;
+  if (sv?.type === 'array' && Array.isArray(value)) v = applySizing(value as ArrVal[], sv);
+  valueW(name).set({ value: v, quality: 'good', ts: new Date().toISOString() });
 }

web/src/lib/types.ts

@@ -28,6 +28,10 @@ export interface SignalMeta {
   description?: string;
   properties?: Record<string, string>;
   tags?: string[];
+  // array-local extra fields (present when type === 'array'):
+  elem?: 'number' | 'bool' | 'array';
+  sizing?: 'dynamic' | 'capped' | 'fixed';
+  capacity?: number;
 }
 
 // A single widget in an interface