Revert "docs(cloud): document lifecycle webhooks"

This reverts commit b4a77f6.

Author: guo-yu

packages/cloud/README.md

@@ -68,59 +68,6 @@ const provider = createProvider(
 3. The request is retried with the payment signature header
 4. The sandbox is created — $0.02 per sandbox (includes 10 min)
 
-## Lifecycle Webhooks
-
-Sandbank Cloud supports operator-managed lifecycle webhooks for box status changes. Tenants do not register these through the SDK today. To receive tenant notifications, send your Sandbank tenant id, webhook URL, and optional secret/token to the Sandbank Cloud operator.
-
-Tenant ids must match the `user_id` stored on boxes. For API-key based tenants, this is the label in `AGENT_API_KEYS`, for example `AGENT_API_KEYS=wanman:key`.
-
-Supported tenant events:
-
-- `box.error`
-- `box.terminated`
-- `box.status_changed`
-
-Tenant webhook payloads are sanitized and omit admin-only fields such as node id, source, and internal detail:
-
-```json
-{
-  "event": "box.error",
-  "audience": "tenant",
-  "tenant_id": "wanman",
-  "box_id": "box-1",
-  "image": "codebox",
-  "previous_status": "running",
-  "status": "error",
-  "reason": "probe_failure",
-  "observed_at": "2026-05-01T05:41:00.000Z"
-}
-```
-
-Requests include `X-Sandbank-Tenant`, `X-Sandbank-Event`, and `X-Sandbank-Delivery`. If a tenant secret is configured, Sandbank sends `X-Sandbank-Signature: sha256=<hmac-sha256>` using HMAC-SHA256 over the exact JSON body. If a token is configured, Sandbank sends `Authorization: Bearer <token>`.
-
-Operator-side configuration examples:
-
-```bash
-ADMIN_BOX_LIFECYCLE_WEBHOOK_URL=https://ops.example.com/webhooks/sandbank
-ADMIN_BOX_LIFECYCLE_WEBHOOK_TOKEN=change-me
-ADMIN_BOX_LIFECYCLE_WEBHOOK_TIMEOUT_MS=2000
-```
-
-Legacy `BOX_LIFECYCLE_WEBHOOK_*` variables are still accepted as fallbacks, but `ADMIN_BOX_LIFECYCLE_WEBHOOK_*` is preferred for new deployments.
-
-```bash
-TENANT_BOX_LIFECYCLE_WEBHOOKS='{
-  "wanman": {
-    "url": "https://wanman.example.com/webhooks/sandbank",
-    "secret": "wanman-hmac-secret",
-    "token": "optional-bearer-token",
-    "events": ["box.error", "box.terminated"],
-    "timeout_ms": 1500
-  }
-}'
-TENANT_BOX_LIFECYCLE_WEBHOOK_TIMEOUT_MS=2000
-```
-
 ## License
 
 MIT