Synced from monorepo

Changes:
- Stop hooks for session lifecycle
- Add x.ai/session/state and x.ai/session/import ACP methods
- Deny-and-continue for auto-mode classifier blocks with denial limits
- Drop codebase-upload from dhat soak test
- scheduler_create upsert via task_id; retire one-shot tasks
- Clipboard: copy file fallback + honest toasts for SSH/Apple Terminal
- Polarity-safe syntax colors in minimal mode
- Auto mode classifies unvetted env prefixes instead of hard-prompting
- Add GROK_CLIPBOARD_NO_OSC52 kill switch to force OSC 52 off

crates/codegen/xai-grok-test-support/src/headless.rs

@@ -27,6 +27,18 @@ pub async fn run_headless(
     server: &MockInferenceServer,
     args: &[&str],
     cwd: &Path,
+) -> HeadlessResult {
+    run_headless_with_env(server, args, cwd, &[]).await
+}
+
+/// Like [`run_headless`], but with extra environment variables applied after the
+/// shared defaults so they take precedence — e.g. to re-enable a feature the
+/// defaults turn off.
+pub async fn run_headless_with_env(
+    server: &MockInferenceServer,
+    args: &[&str],
+    cwd: &Path,
+    env: &[(&str, &str)],
 ) -> HeadlessResult {
     let home = TempDir::new().expect("create temp home");
     let mut cmd = tokio::process::Command::new(grok_binary());
@@ -37,6 +49,7 @@ pub async fn run_headless(
         .stderr(std::process::Stdio::piped())
         .kill_on_drop(true);
     test_env_cmd_tokio(&mut cmd, &server.url(), home.path());
+    cmd.envs(env.iter().copied());
     run_headless_with_cmd(cmd).await
 }