fix(mac-runner): make autorecover LaunchAgent persistent

[FluffyAIcode]

Summary

• install the recovery script under ~/Library/Application Support/Kakeya instead of a TCC-protected repository path
• use the runner directory as the LaunchAgent working directory
• set AbandonProcessGroup=true so the detached Runner.Listener survives after the watchdog exits
• add regression tests for the generated LaunchAgent contract

Why

launchd could not execute recovery scripts from a checkout under ~/Documents, and it killed the fallback nohup runner when the watchdog exited. The runner appeared briefly online but immediately disappeared.

Live verification

• user LaunchAgent installed successfully
• Runner.Listener remains alive after watchdog exit
• runner_healthcheck.sh reports all core checks PASS
• GitHub reports kakeya-mac-m4 online and automatically assigns queued jobs

Tests

• PYTHONPATH=.:sdks/python pytest -q tests/inference_engine/bridge/test_autorecover_installer.py tests/inference_engine/bridge/test_runner_python.py
• bash -n scripts/mac_bridge/install_autorecover_launchagent.sh

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