chore: import upstream snapshot with attribution

crates/jcode-app-core/src/agent/utils.rs

@@ -0,0 +1,39 @@
+use crate::session::GitState;
+use std::path::Path;
+use std::process::Command;
+
+pub(super) fn trace_enabled() -> bool {
+    match std::env::var("JCODE_TRACE") {
+        Ok(value) => {
+            let value = value.trim();
+            !value.is_empty() && value != "0" && value.to_lowercase() != "false"
+        }
+        Err(_) => false,
+    }
+}
+
+pub(super) fn git_state_for_dir(dir: &Path) -> Option<GitState> {
+    let root = git_output(dir, &["rev-parse", "--show-toplevel"])?;
+    let head = git_output(dir, &["rev-parse", "HEAD"]);
+    let branch = git_output(dir, &["rev-parse", "--abbrev-ref", "HEAD"]);
+    let dirty = git_output(dir, &["status", "--porcelain"]).map(|out| !out.is_empty());
+
+    Some(GitState {
+        root,
+        head,
+        branch,
+        dirty,
+    })
+}
+
+fn git_output(dir: &Path, args: &[&str]) -> Option<String> {
+    let output = Command::new("git")
+        .args(args)
+        .current_dir(dir)
+        .output()
+        .ok()?;
+    if !output.status.success() {
+        return None;
+    }
+    Some(String::from_utf8_lossy(&output.stdout).trim().to_string())
+}