tegwick 45a858ead0 feat(coordination): git-backed DecisionLog event store (WP-0009 T1) ...

Factor DecisionLog storage behind an EventStore abstraction: InMemoryEventStore
stays the default/test double, GitEventStore makes the coordination log
git-addressable. Each space is a ref (refs/spaces/<sha1>); append writes an
immutable one-blob commit and advances the ref under compare-and-swap, so the
commit chain is the per-space total order and a racing appender can never fork
the log. Deterministic stable-JSON event serialization. Zero runtime deps
(git CLI via subprocess). API and fold unchanged across backends.

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

2026-06-16 01:41:27 +02:00

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