v0.31.8

docs/ARCHITECTURE.md

@@ -41,9 +41,10 @@ committed document at startup; this is not one cross-memory/SQLite transaction.
 
 ### Rust source organization
 
-Rust modules are kept as small responsibility-oriented files. Every checked-in `.rs` file
-is limited to **500 lines**; `tools/checks/rust_module_contracts.py` enforces the limit across
-the repository. Large logical modules use a thin facade (`config.rs`, `docker.rs`,
+Production Rust modules are kept as small responsibility-oriented files, with a
+**500-line limit** enforced by `tools/checks/rust_module_contracts.py`. Unit and
+integration test files are explicitly exempt: related tests may live together in
+large `tests.rs` files rather than arbitrary numbered fragments. Large logical modules use a thin facade (`config.rs`, `docker.rs`,
 `server.rs`, `runtime.rs`, `balance.rs`, `prometheus.rs`, and similar) plus files in a
 matching directory. `web_server` uses the standard `web_server/mod.rs` facade with
 submodules for configuration, filesystem confinement, responses, routing, FastCGI and