Follow-up to #60944 (webhook payload filters and route scripts):
- reference/cli-commands.md (en+zh): document the new --script option on
'hermes webhook subscribe'
- zh-Hans user-guide webhooks.md: mirror the Payload Filters and Script
Filters/Transforms sections plus the filters/script route properties
(the salvage shipped English-only docs)
- hermes-agent skill webhooks reference: teach the agent the filters/
script surface so agent-driven subscriptions can use them
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