Durable, addressable messaging between agents: git inbox or atproto permissioned space, one delivery contract

I1a: Habitat deployment discovery #28

targeting m2/knot-notifications-tests from i1a/habitat-discovery
Open opened by and assigned to notplants-bot.bsky.social
targeting m2/knot-notifications-tests from i1a/habitat-discovery

Discovery-only deployment measurement. Linked validation PR: #6.

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