Support multiple trigger lexicons in one automation #30

Request #

Let a single automation trigger on more than one collection.

Context #

From https://www.youtube.com/watch?v=5MnT-ZgbBIc, where the user built an automation that adds conference attendees to a Bluesky list:

• The user needed the same steps for id.sifa.meeting and at.youandme.connection and had to build two automations: "I have to do it twice if I want different lexicons."

Details: docs/brainstorms/2026-10-17-graze-conference-automation-feedback.md (F2).