fix(bazel): isolate local build and test state

Signed-off-by: Drew Newberry <anewberry@nvidia.com>

.bazelignore

@@ -0,0 +1 @@
+target

CONTRIBUTING.md

@@ -301,11 +301,7 @@ brew install bazelisk
 npm install -g @bazel/bazelisk
 ```
 
-Bazel builds Z3 from source, so no system Z3 installation is needed when using Bazel. If you have previously built with Cargo, add Cargo's output directory to `.bazelignore` to prevent conflicts:
-
-```bash
-echo "target" >> .bazelignore
-```
+Bazel builds Z3 from source, so no system Z3 installation is needed when using Bazel. The repository's `.bazelignore` excludes Cargo's `target` directory to prevent conflicts with existing Cargo build output.
 
 ### macOS build tools
 

crates/openshell-cli/src/completers.rs

@@ -215,6 +215,7 @@ mod tests {
         with_vars(
             [
                 ("XDG_CONFIG_HOME", Some(tmp.as_str())),
+                ("OPENSHELL_SYSTEM_GATEWAY_DIR", Some(tmp.as_str())),
                 ("OPENSHELL_GATEWAY", None::<&str>),
             ],
             f,