fix(test): stabilise cross-platform test isolation

tests/functional/iam/dry_run.rs

@@ -1,10 +1,10 @@
-use crate::common::cli_helpers::ags;
+use crate::common::cli_helpers::ags_isolated;
 use predicates::prelude::*;
 
 /// --dry-run prints the HTTP method, path, and auth header without making a real request
 #[test]
 fn test_dry_run_shows_request() {
-    ags()
+    ags_isolated()
         .args([
             "--dry-run",
             "--namespace",
@@ -23,7 +23,7 @@ fn test_dry_run_shows_request() {
 /// --dry-run produces no stderr output so stdout can be cleanly piped for inspection
 #[test]
 fn test_dry_run_no_status_on_stderr() {
-    ags()
+    ags_isolated()
         .args([
             "--dry-run",
             "--namespace",

tests/scope_version.rs

@@ -25,11 +25,18 @@ impl CmdOutput {
 }
 
 /// Spawn the `ags` binary with the given args and return its output.
+///
+/// Uses a unique `AGS_HOME` per call so tests don't share profile state
+/// with each other or with the host machine's real config.
 fn cli(args: &[&str]) -> CmdOutput {
+    let unique_dir = std::env::temp_dir()
+        .join(format!("ags-test-{}", std::process::id()))
+        .join(format!("{:?}", std::thread::current().id()));
     let inner = Command::cargo_bin("ags")
         .unwrap()
         .args(args)
         .env("AGS_NO_KEYCHAIN", "1")
+        .env("AGS_HOME", unique_dir)
         .output()
         .expect("failed to execute ags binary");
     CmdOutput { inner }

tests/security/config_permissions.rs

@@ -1,3 +1,4 @@
+#[cfg(unix)]
 use ags::runtime::config::ProfileConfig;
 
 // ── Config file permissions (Unix only) ──