Simplify: one abstract base class per layer #1

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Author SHA1 Message Date
Claude 08fb78721f Simplify: one abstract base class per layer
CI / Node 20 (pull_request) Successful in 10s
CI / Node 22 (pull_request) Successful in 11s
- BaseKVStorage / BaseEventStorage / BaseDocumentStorage define the API once;
  implementations provide only raw primitives (client and server share an API)
- Drop KV indexes, query planner, unique indexes; document stores take index fields
- Escape every char <= '/' so child keys stay contiguous; skip-scan is now simple
- Event-sourced documents = event storage + any document store for projections
- New folder layout (kv-storage, event-storage, document-storage, utils); tests only in test/

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017Qxbkp4tA7G5SCWjzWuxmE
2026-10-23 08:05:03 +00:00