improvise-a0i3: red test, the walk under the user's pathspec and attribute settings

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze

tests/shipped_documents_load.rs

@@ -266,3 +266,29 @@ fn a_scratch_repo_ignores_the_users_default_ignore_and_attributes_files() {
         );
     }
 }
+
+/// improvise-a0i3: pathspec magic and an attribute source are process-wide git
+/// settings, and `--local-env-vars` lists none. Evidence: `context/test-evidence/tui.md`.
+#[test]
+fn the_walk_ignores_the_users_pathspec_and_attribute_settings() {
+    let settings = [
+        ("GIT_LITERAL_PATHSPECS", "1"),
+        ("GIT_GLOB_PATHSPECS", "1"),
+        ("GIT_NOGLOB_PATHSPECS", "1"),
+        ("GIT_ICASE_PATHSPECS", "1"),
+        ("GIT_ATTR_SOURCE", "HEAD"),
+    ];
+    let mut failed = Vec::new();
+    for (name, value) in settings {
+        for test in [
+            "a_gzipped_document_is_walked",
+            "every_shipped_document_loads",
+        ] {
+            let out = rerun_with_env(test, &[(name, Path::new(value))]);
+            if !out.status.success() {
+                failed.push(format!("{test} under {name}={value}: {}", told(&out)));
+            }
+        }
+    }
+    assert!(failed.is_empty(), "{}", failed.join("\n"));
+}