Add Modal and ComputeSDK built-in providers, update examples and docs

- Add `sandbox-agent/modal` provider using Modal SDK with node:22-slim image
- Add `sandbox-agent/computesdk` provider using ComputeSDK's unified sandbox API
- Update Modal and ComputeSDK examples to use new SDK providers
- Update Modal and ComputeSDK deploy docs with provider-based examples
- Add Modal to quickstart CodeGroup and docs.json navigation
- Add provider test entries for Modal and ComputeSDK
- Remove old standalone example files (modal.ts, computesdk.ts)

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

sdks/typescript/package.json

@@ -38,6 +38,14 @@
     "./cloudflare": {
       "types": "./dist/providers/cloudflare.d.ts",
       "import": "./dist/providers/cloudflare.js"
+    },
+    "./modal": {
+      "types": "./dist/providers/modal.d.ts",
+      "import": "./dist/providers/modal.js"
+    },
+    "./computesdk": {
+      "types": "./dist/providers/computesdk.d.ts",
+      "import": "./dist/providers/computesdk.js"
     }
   },
   "peerDependencies": {
@@ -46,7 +54,9 @@
     "@e2b/code-interpreter": ">=1.0.0",
     "@vercel/sandbox": ">=0.1.0",
     "dockerode": ">=4.0.0",
-    "get-port": ">=7.0.0"
+    "get-port": ">=7.0.0",
+    "modal": ">=0.1.0",
+    "computesdk": ">=0.1.0"
   },
   "peerDependenciesMeta": {
     "@cloudflare/sandbox": {
@@ -66,6 +76,12 @@
     },
     "get-port": {
       "optional": true
+    },
+    "modal": {
+      "optional": true
+    },
+    "computesdk": {
+      "optional": true
     }
   },
   "dependencies": {
@@ -94,6 +110,8 @@
     "@vercel/sandbox": ">=0.1.0",
     "dockerode": ">=4.0.0",
     "get-port": ">=7.0.0",
+    "modal": ">=0.1.0",
+    "computesdk": ">=0.1.0",
     "openapi-typescript": "^6.7.0",
     "tsup": "^8.0.0",
     "typescript": "^5.7.0",