fix(tests): prevent registry corruption via CWD leak and unmocked calls

[JacksonFergusonDev]

Description

This PR fixes a critical issue where the test suite was leaking the Current Working Directory (CWD) state between tests and inadvertently modifying the user's actual ~/.local/state/git-pulsar/registry.

The Problem

Several tests in tests/test_cli.py were using os.chdir(tmp_path) to switch to a temporary test directory but were not resetting it.

1. CWD Leak: Pytest runs in a single process. When os.chdir is used without cleanup, the process remains in the temp folder for all subsequent tests.
2. Side Effects:
   • test_main_triggers_bootstrap was falling through to setup_repo(), which (because it wasn't mocked) registered the leaked temp directory into the user's real registry file.
   • This caused "ghost entries" in the registry and triggered "Repo missing" notifications from the actual background daemon.

The Fix

1. Use monkeypatch.chdir: Replaced all instances of os.chdir(tmp_path) with monkeypatch.chdir(tmp_path) in tests/test_cli.py. This ensures the CWD is automatically restored to its original state after each test.
2. Mock setup_repo: Added a mock for git_pulsar.cli.setup_repo in test_main_triggers_bootstrap to ensure it never attempts to run real setup logic during the test.

Changes

• tests/test_cli.py:
  • Updated test_setup_repo_initializes_git
  • Updated test_main_triggers_bootstrap
  • Updated test_pause_command
  • Updated test_status_reports_pause_state
  • Updated test_diff_shows_untracked_files

Verification

• Ran pytest.
• Verified ~/.local/state/git-pulsar/registry is no longer modified during test runs.
• Verified no "ghost entry" notifications are triggered.