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

M2: knot notification tests #27

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

Linked product PR: #3. Tests matching stream wakeups, reconnect recovery, and polling fallback.

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