huskies: merge 1199 story Orphaned build-dir GC: reclaim dead worktree targets without touching warm caches

server/src/agents/pool/worktree_lifecycle.rs

@@ -157,6 +157,12 @@ pub(crate) async fn on_coding_transition(project_root: &Path, port: u16, story_i
 }
 
 /// Remove the worktree and feature branch for `story_id` after it reaches a terminal stage.
+///
+/// Story 1199: bytes-reclaimed accounting for the worktree's `target/` dir
+/// happens one layer down, in `remove_worktree` — the single choke point
+/// shared by this subscriber, the `remove_worktree` MCP tool, and
+/// `worktree::cleanup`/`sweep`. Logging it there (once) avoids a duplicate
+/// log line here.
 pub(crate) async fn on_terminal_transition(project_root: &Path, story_id: &str) {
     let config = match crate::config::ProjectConfig::load(project_root) {
         Ok(c) => c,
@@ -270,6 +276,30 @@ mod tests {
         );
     }
 
+    /// Story 1199 AC4: on_terminal_transition reclaims the worktree's target/
+    /// dir (and everything else in the worktree) when removing it.
+    #[tokio::test]
+    async fn terminal_transition_reclaims_target_dir() {
+        let tmp = TempDir::new().unwrap();
+        let root = setup_project(&tmp);
+        let story_id = "1006_test_reclaim_target";
+
+        on_coding_transition(&root, 3001, story_id).await;
+        let wt_path = crate::worktree::worktree_path(&root, story_id);
+        let target_dir = wt_path.join("target");
+        fs::create_dir_all(&target_dir).unwrap();
+        fs::write(target_dir.join("build_artifact.bin"), vec![0u8; 512]).unwrap();
+        assert!(target_dir.exists(), "target/ must exist before cleanup");
+
+        on_terminal_transition(&root, story_id).await;
+
+        assert!(
+            !target_dir.exists(),
+            "target/ dir must be reclaimed when the worktree is removed"
+        );
+        assert!(!wt_path.exists());
+    }
+
     /// AC2: on_terminal_transition is a no-op (non-fatal) when no worktree exists.
     #[tokio::test]
     async fn terminal_transition_noop_when_no_worktree() {