test(issue-17): herdr 0.9.3 keeps a removed directory as the restored pane's cwd

test_b_only_the_resumed_sessions_restored_shell_is_closed asserted that a
pane whose directory was removed comes back in $HOME. That is herdr 0.9.1;
herdr 0.9.3 keeps the old path. The cwd check now takes either, with a note
on which version does what; closing never looked at the cwd.
herdr_restore.py's docstring said the same "$HOME when that directory is
gone" and now names both versions.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HCGpJXhSZasJLU38ksDghe

tests/test_issue45_restore.py

@@ -264,7 +264,7 @@ def test_b_only_the_resumed_sessions_restored_shell_is_closed(rig):
         rig.run_agent(rig.new_pane(rig.root / f"ws{k}", k), ids[k])
     rig.new_pane(rig.root / "wsU", "U")  # a user's plain shell: no agent_session
     rig.crash(*ids.values())
-    shutil.rmtree(rig.root / "wsY")  # a removed worktree: restored into $HOME
+    shutil.rmtree(rig.root / "wsY")  # a removed worktree: still restored (cwd below)
 
     before = rig.restores()
     rig.start_via_shim()
@@ -272,7 +272,9 @@ def test_b_only_the_resumed_sessions_restored_shell_is_closed(rig):
     rig.run_agent(_pane_with(rig, ids["Z"])["pane_id"], ids["Z"])  # running again
     rig.hd("pane", "run", _pane_with(rig, ids["X2"])["pane_id"], "sleep 60")  # busy shell
     time.sleep(1)
-    assert _pane_with(rig, ids["Y"])["cwd"] == str(rig.root)
+    # Y's directory is gone: herdr 0.9.1 restores the pane into $HOME (rig.root),
+    # 0.9.3 keeps the old path. Closing does not look at the cwd either way.
+    assert _pane_with(rig, ids["Y"])["cwd"] in (str(rig.root), str(rig.root / "wsY"))
     n = len(rig.panes())
 
     for k in ("Z", "X2"):