Resolve Client.Rust-021

Client.Rust-021 (Design adherence): RustClientDesign.md "Crate layout"
section now describes the actual flat workspace structure instead of
the aspirational nested form. The replacement text states that the
workspace root is clients/rust/, the top-level crate
zb-mom-ww-mxgateway-client is declared in clients/rust/Cargo.toml
directly, and crates/mxgw-cli/ is the sole [workspace.members] entry.
The accompanying tree lists the real files on disk (Cargo.toml,
Cargo.lock, build.rs, README.md, RustClientDesign.md,
src/{lib,client,session,galaxy,options,auth,error,value,version,generated}.rs
plus the src/generated/ tonic-build output dir, tests/, and
crates/mxgw-cli/).

Doc-only change. cargo build --workspace + cargo test --workspace clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

clients/rust/RustClientDesign.md

@@ -11,25 +11,38 @@ generated contract inputs.
 
 ## Crate Layout
 
-Recommended layout:
+The workspace is rooted at `clients/rust/`. The top-level crate
+`zb-mom-ww-mxgateway-client` is declared by `clients/rust/Cargo.toml` itself
+(flat layout — its `src/` sits directly under the workspace root, not nested
+inside `crates/`). The only `[workspace.members]` entry is the `mxgw-cli`
+binary subcrate under `crates/mxgw-cli/`.
 
 ```text
 clients/rust/
-  Cargo.toml
-  build.rs
-  crates/
-    zb-mom-ww-mxgateway-client/
-      src/lib.rs
-      src/client.rs
-      src/session.rs
-      src/options.rs
-      src/auth.rs
-      src/value.rs
-      src/error.rs
-      src/generated/
-    mxgw-cli/
-      src/main.rs
+  Cargo.toml          # workspace root + top-level crate `zb-mom-ww-mxgateway-client`
+  Cargo.lock
+  build.rs            # tonic-build proto generation
+  README.md
+  RustClientDesign.md
+  src/
+    lib.rs
+    client.rs
+    session.rs
+    galaxy.rs
+    options.rs
+    auth.rs
+    error.rs
+    value.rs
+    version.rs
+    generated.rs      # `pub mod` wrappers around files under `src/generated/`
+    generated/        # tonic-build output (not hand-edited)
   tests/
+    client_behavior.rs
+    proto_fixtures.rs
+  crates/
+    mxgw-cli/         # sole workspace member — binary `mxgw`
+      Cargo.toml
+      src/main.rs
 ```
 
 Expected dependencies:

code-reviews/Client.Rust/findings.md

@@ -7,7 +7,7 @@
 | Review date | 2026-05-24 |
 | Commit reviewed | `d692232` |
 | Status | Reviewed |
-| Open findings | 1 |
+| Open findings | 0 |
 
 ## Checklist coverage
 
@@ -420,10 +420,10 @@ The CLI integration in Client.Rust-014 works either way; this is solely about de
 | Severity | Low |
 | Category | Design-document adherence |
 | Location | `clients/rust/RustClientDesign.md:14-33` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** The crate-name change in commit `397d3c5` (top-level `mxgateway-client` → `zb-mom-ww-mxgateway-client`) is reflected in `Cargo.toml`, `Cargo.lock`, every `use zb_mom_ww_mxgateway_client::` import, and `build.rs`. The "Recommended layout" block in `RustClientDesign.md:21-33` shows a nested structure with a top-level `crates/zb-mom-ww-mxgateway-client/` subdirectory containing `src/lib.rs`, `src/client.rs`, etc. — but the actual layout on disk is flat: the top-level crate lives at `clients/rust/` directly (with `src/`, `Cargo.toml`, and `build.rs` at the workspace root) and `crates/mxgw-cli/` is the only nested member. A reader consulting the design to understand the layout will be misled into looking for `crates/zb-mom-ww-mxgateway-client/` that does not exist. `CLAUDE.md` requires design docs to track code changes.
 
 **Recommendation:** Update `RustClientDesign.md:14-33` to describe the actual flat layout: workspace root at `clients/rust/`, top-level crate `zb-mom-ww-mxgateway-client` (declared in `Cargo.toml`) with `src/lib.rs`, `src/client.rs`, etc. directly under it; `crates/mxgw-cli/` is the single member subcrate. Alternatively label the block as "Aspirational nested layout (not currently adopted)" and add a separate "Current layout" section.
 
-**Resolution:** _(empty until closed)_
+**Resolution:** 2026-05-24 — Rewrote the "Crate Layout" section of `clients/rust/RustClientDesign.md` to describe the actual flat layout on disk instead of the aspirational nested form. The section now opens with a short paragraph stating that the workspace is rooted at `clients/rust/`, that `clients/rust/Cargo.toml` declares the top-level crate `zb-mom-ww-mxgateway-client` itself (flat layout — `src/` sits directly under the workspace root, not under `crates/`), and that the only `[workspace.members]` entry is the `mxgw-cli` binary subcrate under `crates/mxgw-cli/`. The accompanying tree replaces the fictitious `crates/zb-mom-ww-mxgateway-client/` subdirectory with the real files: `Cargo.toml`, `Cargo.lock`, `build.rs`, `README.md`, `RustClientDesign.md`, `src/{lib,client,session,galaxy,options,auth,error,value,version,generated}.rs` plus `src/generated/` (tonic-build output), `tests/{client_behavior,proto_fixtures}.rs`, and `crates/mxgw-cli/` annotated as the sole workspace member producing the `mxgw` binary. `cargo build --workspace` and `cargo test --workspace` are clean at HEAD (29 tests pass across the library, integration, and proto-fixture targets). `cargo clippy --workspace --all-targets -- -D warnings` reports three pre-existing errors at HEAD on this dev box (`options.rs:98,143` missing docs, `galaxy.rs:282` `clone_on_copy`, `session.rs:522` `enum_variant_names`) that exist independently of this doc-only change — verified by running clippy with the design-doc edit stashed; tracking those is out of scope for Client.Rust-021.