giles f8b96b3d81 H6: durable activity dedup — same :id processed at most once, ever (TDD) ...

Failing tests first (3 red: a redelivered activity reran its behavior — behavior/process starts
from an empty trace, so dedup evaporated per call). host/blog--process-local! now atomically
claims the :id on persist stream 'activities:processed' via ev/book! (the same append-expect
acquire as seats/votes) and returns a :deduped trace on duplicates. Store-backed → survives outbox
retries AND restarts. Prerequisite for non-idempotent effects (payment). Id-less activities process
unchecked.

blog suite 250/250 (+3).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-07-03 10:45:55 +00:00

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