Motivation:
Concurrent request dispatch can reorder state-dependent RPCs. Config reads and writes are lightweight enough to serialize on a global config key, so the test suite should cover pipelined write/read behavior before adding the queue implementation.
Summary:
Add a config/value/write followed immediately by config/read integration test that asserts the read observes the written model value.
Testing:
- cargo test -p codex-app-server --test all config_read_after_pipelined_write_sees_written_value
- cargo test -p codex-app-server