Add linux support

[dimitriosGX]

Summary by cubic

Add Linux support with a per-user systemd service for the detector daemon. It auto-starts on login, restarts on failure, and falls back cleanly on non-systemd distros.

• New Features

  • Added service::linux using a per-user unit at ~/.config/systemd/user/edison-detectord.service (selected on target_os = "linux").
  • Idempotent install writes the unit, seeds PATH, appends logs to logs/detectord.log, reloads, and enables --now; uninstall disables and removes the unit.
  • Supports enforcing vs report-only modes via ExecStart (--enforce or --no-hooks).
  • Detects when a systemd user instance is unavailable and returns an actionable message suggesting edison-detectord daemon as a fallback.

• Bug Fixes

  • Quote the binary path in ExecStart to handle spaces and avoid status=203/EXEC; added tests to cover this.

^{Written for commit 8bfb028. Summary will update on new commits.}

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[cubic-dev-ai]

All reported issues were addressed across 3 files

Confidence score: 5/5

• Safe to merge after the addressed issues were fixed.

<sub>Reply with feedback, questions, or to request a fix.

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