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ci / JVM build + tests (push) Failing after 1m2s
- Introduced a new `:journal-inmemory` module implementing `:journal-api` with an in-memory backend. - Added `InMemoryJournalStore` for concurrent append, list, and clear operations using `Mutex` and `MutableList`. - Use cases include tests, dev mode, embedded scenarios, and client-side in-process caching. - Integrated the module into the project setup and documented usage in `:client/README.md`. - Added comprehensive