feat: file-backed blob store + multi-process IPC integration test#88
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Add file_state_blob_store: a filesystem-backed content-addressed blob store using a git-style 2-char prefix directory layout. Blobs are written atomically via temp-file + rename(2) and deduplicated by SHA-256 digest. The store scans the root directory on construction to rebuild its in-memory index. Add state_multiprocess_ipc_test: three integration tests that fork() two processes and replicate state mutations over a real Unix domain socket connection. Tests cover unidirectional value replication, bidirectional replication, and metadata (comment) replication. - 13 file blob store tests (CRUD, persistence, concurrency, layout) - 3 multi-process IPC tests (POSIX-only, guarded by #ifndef _WIN32) - All 16 tests pass locally
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Summary
Add two new capabilities to the distributed state infrastructure:
File-backed blob store (
file_state_blob_store)<root>/ab/cdef01...)rename(2)Multi-process IPC integration test (
state_multiprocess_ipc_test)fork()two OS processes and replicate state over a real Unix domain socket connectionValueReplication: parent writes value, child receives via IPCBidirectionalReplication: both processes write, each receives the other's valueMetadataReplication: parent sets value + comment, child receives both#ifndef _WIN32)Test results