a8e1ddc913
The diagnostic milestones used to root-cause the intermittent boot 'freeze' (attach_device milestones, usbhubd HUBFLOW decision points, reactor/enumerator startup) moved from info to debug! so production logs stay clean. One-line-per-boot startup confirmations (scheme registered, daemon ready, reactor started, enumerator started, reactor dispatch mode, enumerator running) remain at info as genuinely useful low-volume startup evidence.