feat: replace launchd with systemd user-unit install path
Operator-direction 2026-05-17 "we will never use mac" — no compat
preservation. Single-cutover replacement.
- new packages/daemon/src/systemd.ts: install/uninstall/status using
systemctl --user + ~/.config/systemd/user/sf-server.service
- new packages/daemon/src/systemd.test.ts: ports launchd tests, same
shape, mocked systemctl via RunCommandFn injection + SF_SYSTEMD_USER_DIR
env override for real filesystem tests
- cli-main.ts: switch import + update help text + status messages
- index.ts: re-export systemd module (installSystemdUnit, uninstallSystemdUnit,
systemdUnitStatus, generateUnit, getServicePath, SystemdStatus, SystemdUnitOptions)
- DELETED: launchd.ts (253 LOC), launchd.test.ts (379 LOC)
- docs/dev/drafts/M053-per-repo-supervisor.md: remove "launchd" mention
- CHANGELOG.md: document systemd-only install path
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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