Under the hood
Each session now has its own dedicated 'engineStore' slot alongside existing per-session data stores
What
Claude Code's per-session state container now allocates a new engineStore, sitting alongside existing per-conversation stores like the cost ledger, hook registry, and model selection. When a session is forked, the new store is inherited from the root session.
Why
This is internal session-state plumbing; the finding doesn't say what the new store is used for.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
What data or feature `engineStore` actually holds is not stated.