feat(sdk): P4.5 @insignia/iios-support-web (composes message-web + support REST)

SupportProvider (wraps MessageProvider + support client); useEscalate, useTickets/
useAssignedTickets (+createTicket/patch), useCallbackRequest, useAvailability;
re-exports useThread/useMessages. Boundary allowlist: support-web -> contracts+
kernel-client+message-web+inbox-web.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/iios-support-web/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "@insignia/iios-support-web",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "main": "dist/index.js",
+  "module": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "exports": { ".": { "types": "./dist/index.d.ts", "import": "./dist/index.js" } },
+  "files": ["dist"],
+  "scripts": {
+    "build": "tsup",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@insignia/iios-kernel-client": "workspace:*",
+    "@insignia/iios-message-web": "workspace:*"
+  },
+  "peerDependencies": {
+    "react": ">=18"
+  },
+  "devDependencies": {
+    "@types/react": "^19.0.0",
+    "react": "^19.0.0",
+    "tsup": "^8.3.5",
+    "typescript": "^5.7.3"
+  }
+}