SubsWatch_Onboarding_v1

First-equip onboarding skill for SubsWatch personal skill (SW-SKILL-PSN-001). Guides the steward through a structured conversation to collect subscribed services, notification preferences, and delivery channel settings. Persists all values to STREAM and TENET, then activates SW-SKILL-PSN-001. Executes once. Skips if STREAM.scratch.psn_onboarding_complete is true.