docs consolidation work

docs/modules/notify/schemas/webhook.schema.json

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+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://stella-ops.org/notify/schemas/webhook.schema.json",
+  "title": "Notify Webhook Payload",
+  "type": "object",
+  "required": ["schema_version", "tenant_id", "delivery_id", "signature", "body"],
+  "properties": {
+    "schema_version": { "type": "string", "pattern": "^v[0-9]+\\.[0-9]+$" },
+    "tenant_id": { "type": "string", "minLength": 1 },
+    "delivery_id": { "type": "string", "pattern": "^[0-9a-fA-F-]{18,36}$" },
+    "signature": { "type": "string" },
+    "hmac_id": { "type": "string" },
+    "body": { "type": "object" },
+    "sent_at": { "type": "string", "format": "date-time" },
+    "nonce": { "type": "string" },
+    "audience": { "type": "string" },
+    "expires_at": { "type": "string", "format": "date-time" }
+  },
+  "additionalProperties": false
+}