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add storage foundation contracts

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Azamat 2026-04-07 19:31:50 +03:00
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# 009 Storage foundation
## Context
- v1 storage slice needs workspace, chat and file flows before durable DB
- trusted caller passes `user_id`, and one workspace belongs to one user
- chat content must live outside sandbox lifecycle and survive sandbox restart
## Decision
- metadata repositories are in-memory for the first storage slice
- `Workspace`, `Chat` and `ChatFile` are first-class domain entities
- filesystem access stays behind storage ports in outer layers
- sandbox later integrates through chat metadata and storage ports, not raw path math in usecases
## Consequences
- metadata is lost on restart in this phase
- storage usecases and HTTP API can be built before durable persistence
- later durable metadata can replace in-memory adapters behind the same ports