docs(hook): say post-merge runs in the destination worktree regardless of removal

docs/src/content/docs/hook.md

@@ -165,7 +165,7 @@ All hooks share the same perspective — `{{ branch | hash_port }}` produces the
 
 - `pre-switch`: hook runs in the source worktree; `worktree_path` is the destination when that worktree already exists — a switch that creates one has no destination directory yet, so `worktree_path` stays on the source (use `pre-start` to work in the new worktree)
 - `post-remove`: the active worktree is gone, so the hook runs in the primary worktree
-- `post-merge` with removal: the active worktree is gone, so the hook runs in the target worktree
+- `post-merge`: the hook runs in the target branch's worktree (the primary worktree if the target has none), including under `--no-remove`, where the merged worktree `worktree_path` names is still on disk
 
 Undefined variables error — use conditionals or defaults for optional behavior:
 

src/cli/mod.rs

@@ -1762,7 +1762,7 @@ All hooks share the same perspective — `{{ branch | hash_port }}` produces the
 
 - `pre-switch`: hook runs in the source worktree; `worktree_path` is the destination when that worktree already exists — a switch that creates one has no destination directory yet, so `worktree_path` stays on the source (use `pre-start` to work in the new worktree)
 - `post-remove`: the active worktree is gone, so the hook runs in the primary worktree
-- `post-merge` with removal: the active worktree is gone, so the hook runs in the target worktree
+- `post-merge`: the hook runs in the target branch's worktree (the primary worktree if the target has none), including under `--no-remove`, where the merged worktree `worktree_path` names is still on disk
 
 Undefined variables error — use conditionals or defaults for optional behavior:
 

tests/integration_tests/merge.rs

@@ -866,6 +866,45 @@ fn test_merge_post_merge_runs_with_nothing_to_merge(mut repo: TestRepo) {
     wait_for_file(&marker_file);
 }
 
+#[rstest]
+fn test_merge_post_merge_runs_in_destination_with_no_remove(mut repo: TestRepo) {
+    // `--no-remove` keeps the feature worktree, but `post-merge` is anchored on
+    // the merge destination either way: the hook's cwd is the target worktree,
+    // not the preserved feature worktree its `worktree_path` names.
+    let config_dir = repo.root_path().join(".config");
+    fs::create_dir_all(&config_dir).unwrap();
+    fs::write(
+        config_dir.join("wt.toml"),
+        r#"post-merge = "echo ran > post-merge-cwd.txt""#,
+    )
+    .unwrap();
+    repo.commit("Add config");
+
+    let feature_wt = repo.add_worktree("feature");
+    fs::write(feature_wt.join("feature.txt"), "feature content").unwrap();
+
+    let output = repo
+        .wt_command()
+        .args(["merge", "main", "--no-remove", "--yes"])
+        .current_dir(&feature_wt)
+        .output()
+        .unwrap();
+    assert!(
+        output.status.success(),
+        "merge failed:\n{}",
+        String::from_utf8_lossy(&output.stderr)
+    );
+
+    // The hook wrote its marker relative to its cwd: the destination worktree.
+    wait_for_file(&repo.root_path().join("post-merge-cwd.txt"));
+    let feature_marker = feature_wt.join("post-merge-cwd.txt");
+    assert!(
+        !feature_marker.exists(),
+        "post-merge ran in the preserved feature worktree: {}",
+        feature_marker.display()
+    );
+}
+
 #[rstest]
 fn test_merge_post_merge_runs_from_main_branch(repo: TestRepo) {
     // Verify post-merge hooks run when merging from main to main (nothing to do)