chore(spec): regenerate api-surface and export-origins on the merged tree

The os-regen driver kept one side of both contracts.json shards; the
generators re-derive them from the merged source, carrying both
IWebhookService (from main) and ITriggerApiService.

Claude-Session: https://claude.ai/code/session_016njDy8ozy9B9Ns5Y8kAWEK
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/spec/api-surface/contracts.json

@@ -164,6 +164,7 @@
     "IStorageService (interface)",
     "ITeamGraphService (interface)",
     "ITriggerApiService (interface)",
+    "IWebhookService (interface)",
     "ImportObjectOpts (interface)",
     "ImportObjectResult (interface)",
     "InboxListResult (interface)",

packages/spec/export-origins/contracts.json

@@ -164,6 +164,7 @@
     "IStorageService": "src/contracts/storage-service.ts#IStorageService (interface)",
     "ITeamGraphService": "src/contracts/sharing-service.ts#ITeamGraphService (interface)",
     "ITriggerApiService": "src/contracts/trigger-api-service.ts#ITriggerApiService (interface)",
+    "IWebhookService": "src/contracts/webhook-service.ts#IWebhookService (interface)",
     "ImportObjectOpts": "src/contracts/external-datasource-service.ts#ImportObjectOpts (interface)",
     "ImportObjectResult": "src/contracts/external-datasource-service.ts#ImportObjectResult (interface)",
     "InboxListResult": "src/contracts/notification-service.ts#InboxListResult (interface)",