Expand PID recognition for broker daemon and clean non-broker PIDs before spawn

[SoundBlaster]

Motivation

• Improve detection of running broker daemons across different installation/launch forms and avoid treating unrelated live processes as the broker when auto-spawning.

Description

• Change _pid_belongs_to_broker to require the --broker-daemon token and accept multiple executable name tokens ("mcpbridge_wrapper", "mcpbridge-wrapper", and "xcodemcpwrapper").
• Update _spawn_broker_if_needed to check _pid_belongs_to_broker and clean stale files when a live PID does not belong to the broker, and to rearrange the version-mismatch logic accordingly.
• Add tests that exercise the expanded PID recognition and the behavior when a live unrelated PID is present, and update existing tests to mock the new PID-checking behavior where appropriate.

Testing

• Ran the unit tests for the broker proxy module using pytest tests/unit/test_broker_proxy.py, which includes the new tests test_pid_belongs_to_broker_true_for_console_script_command, test_pid_belongs_to_broker_true_for_legacy_wrapper_command, and test_live_non_broker_pid_is_treated_as_stale.
• All updated and new tests passed locally.

---

Codex Task