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October 3, 2026 13:12
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Summary
Add the session Writer on top of the session kernel.
Responsibilities
The Writer is the single in-process write entry for a Session. It coordinates:
The session kernel remains responsible for lineage, storage, append ordering,
and epoch fencing.
Commit flow
Authoritative projection failures reject the commit before persistence.
Derived projection failures mark the projection unhealthy after the commit is
durable.
Unknown append outcomes fail the Writer closed until it is reopened and
reconciled. Cache writes and observer notifications happen outside the Writer
lock while preserving commit order.
Cost model
Commit cost grows with the number of events, artifact references, and registered
projections. Writer startup replays only the history not covered by valid
projection cache entries.