feat(#1,#4): queue-before-load + identity state machine

Every provider method is now safe to call before the CDN script
finishes booting. Calls buffered into a per-provider queue, drained
in order once the real global is exposed.

- new _queue.ts: generic in-memory op queue with ready/reset/drain
- new _identity.ts: state machine (anonymous/identified) with
  onChange listeners and typed Verification discriminated union
  (hmac for intercom/crisp/tawk/chatwoot, jwt for hubspot,
  jwt+callback for zendesk messenger)
- intercom: install official queue stub before CDN boots so pre-load
  calls are preserved; HMAC via user_hash
- crisp: keep queue-native \$crisp.push; HMAC for user:email
- tawk: Tawk_API.onLoad feeds our queue; HMAC for setAttributes
- zendesk: queue over zE; jwt or callback required for loginUser
- hubspot: _hsq queue-native for identify/track; hsConversationsOnReady
  feeds our queue for widget ops; jwt verification sets identificationToken
- chatwoot: chatwoot:ready event feeds queue; identifier_hash for setUser
- every method is SSR-safe (returns resolved Promise when !isBrowser())

Tests: 39 green (queue drain order, reentrant enqueue, identity
transitions, pre-boot call buffering via jsdom).

Preempts competitor bugs cited in #1 (react-use-intercom#635/#747/#824,
crisp-sdk-web#11/#28, tawk-messenger-react#9/#26) and #4
(chatwoot#7065/#13448, crisp-sdk-web#19/#32/#49).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: productdevbook

package.json

@@ -4,27 +4,27 @@
   "description": "Zero-dependency TypeScript wrappers for live chat & customer support widgets — Intercom, Crisp, Tawk.to, Zendesk, HubSpot and more. Unified API, tree-shakeable.",
   "keywords": [
     "ahize",
-    "live-chat",
-    "customer-support",
     "chat-widget",
-    "intercom",
-    "crisp",
-    "tawk",
-    "zendesk",
-    "hubspot",
     "chatwoot",
-    "self-hosted",
-    "livechat",
+    "crisp",
+    "customer-support",
     "drift",
+    "esm",
     "freshchat",
     "helpscout",
+    "hubspot",
+    "intercom",
+    "live-chat",
+    "livechat",
     "olark",
-    "userlike",
+    "self-hosted",
     "smartsupp",
+    "tawk",
     "tree-shakeable",
     "typescript",
-    "zero-dependency",
-    "esm"
+    "userlike",
+    "zendesk",
+    "zero-dependency"
   ],
   "homepage": "https://github.com/productdevbook/ahize",
   "bugs": {
@@ -88,6 +88,7 @@
     "@typescript/native-preview": "7.0.0-dev.20260316.1",
     "@vitest/coverage-v8": "^4.1.2",
     "bumpp": "^11.0.1",
+    "jsdom": "^29.0.2",
     "obuild": "^0.4.32",
     "oxfmt": "^0.42.0",
     "oxlint": "^1.57.0",