fix(core/git-worktree): gate target cache mirroring

codex-rs/core/src/git_worktree.rs

@@ -59,6 +59,16 @@ pub const LOCAL_DEFAULT_REMOTE: &str = "local-default";
 const BRANCH_METADATA_DIR: &str = "_branch-meta";
 const DEFAULT_BRANCH_CACHE_DIRS: &[&str] = &["node_modules"];
 
+fn branch_copy_targets_enabled() -> bool {
+    std::env::var("CODEX_BRANCH_COPY_TARGETS")
+        .ok()
+        .map(|v| {
+            let v = v.to_ascii_lowercase();
+            v == "1" || v == "true" || v == "yes"
+        })
+        .unwrap_or(false)
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
 pub struct BranchMetadata {
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -503,7 +513,9 @@ fn gather_branch_cache_candidates(src_root: &Path) -> Vec<PathBuf> {
         .map(PathBuf::from)
         .collect();
 
-    append_cargo_targets(src_root, &mut out);
+    if branch_copy_targets_enabled() {
+        append_cargo_targets(src_root, &mut out);
+    }
 
     if let Some(raw) = std::env::var_os("CODEX_BRANCH_COPY_DIRS") {
         out.extend(std::env::split_paths(&raw));

docs/slash-commands.md

@@ -29,7 +29,9 @@ Notes
   previous Code snapshot and optionally rewind the conversation to that point.
 - `/branch [task]`: create a worktree branch and switch to it. If a
   task/description is provided, it is used when naming the branch. Must be run
-  from the repository root (not inside another branch worktree).
+  from the repository root (not inside another branch worktree). By default it
+  only mirrors `node_modules`; set `CODEX_BRANCH_COPY_TARGETS=1` to also copy
+  Rust build caches into the worktree.
 - `/merge`: merge the current worktree branch back into the default branch and
   remove the worktree. Run this from inside the worktree created by `/branch`.
 - `/review [focus]`: without arguments, opens a review picker so you can audit