fix(agent): align World Packet with reviewer feedback and voice parity

Reuse one context/contacts/tracking owner in voice and World Packet. Compare voice outputs after stripping presentation fields; remove the unconsumed fingerprint API pending an actual caller. Document the exported packet boundary and reject null options safely.

Review guidance: asturksever on origin #880; Windows parity diagnosis by quanticsoul4772. Existing source ownership retained.

src/agent/worldPacket.js

@@ -6,7 +6,7 @@ import {
 } from '../data/layerSnapshot.js';
 import { contextModeWord } from '../contextModePolicy.js';
 
-const TRACKABLE_FAMILIES = Object.freeze([
+export const TRACKABLE_FAMILIES = Object.freeze([
   { layerId: 'flights', kind: 'aircraft' },
   { layerId: 'military', kind: 'aircraft' },
   { layerId: 'ais-live-vessels', kind: 'vessel' },
@@ -24,37 +24,6 @@ const NESTED_CONTEXT_RESULT_FIELDS = Object.freeze([
   'contextRollback',
 ]);
 
-const NON_SEMANTIC_PACKET_KEYS = new Set(['note', 'ageLabel', 'generatedAt']);
-
-function semanticPacketValue(value) {
-  if (Array.isArray(value)) return value.map(semanticPacketValue);
-  if (!value || typeof value !== 'object') return value;
-  const out = {};
-  for (const key of Object.keys(value).sort()) {
-    if (NON_SEMANTIC_PACKET_KEYS.has(key)) continue;
-    out[key] = semanticPacketValue(value[key]);
-  }
-  return out;
-}
-
-/**
- * Stable semantic fingerprint for change detection, not authentication.
- *
- * Presentation-only narration/age labels are excluded. Feed state, source,
- * lastUpdate, camera, context, tracked entities, and other semantic state stay
- * inside the digest.
- */
-export function semanticWorldPacketFingerprint(packet) {
-  const canonical = JSON.stringify(semanticPacketValue(packet));
-  let hash = 0xcbf29ce484222325n;
-  const prime = 0x100000001b3n;
-  for (let i = 0; i < canonical.length; i += 1) {
-    hash ^= BigInt(canonical.charCodeAt(i));
-    hash = BigInt.asUintN(64, hash * prime);
-  }
-  return `fnv1a64:${hash.toString(16).padStart(16, '0')}`;
-}
-
 /**
  * Translate context-mode payloads into the public tool vocabulary while
  * retaining the internal id beside each translated field.
@@ -124,13 +93,14 @@ export function activeContactsWindow(dataManager) {
  * This performs no network requests and intentionally mirrors the historical
  * get_current_view_state payload so voice can delegate without behavior drift.
  */
-export function getWorldPacket({
-  viewer,
-  styleManager,
-  dataManager,
-  sceneDirector = null,
-  now = Date.now(),
-} = {}) {
+export function getWorldPacket(options = {}) {
+  const {
+    viewer,
+    styleManager,
+    dataManager,
+    sceneDirector = null,
+    now = Date.now(),
+  } = options ?? {};
   if (!viewer?.camera?.positionWC)
     throw new TypeError('World Packet requires a viewer camera');
   if (!dataManager || typeof dataManager.getAll !== 'function')