Channel planner

This module is stubbed for Phase 1. It plugs into the studio's existing a new planning layer on top of the existing Lead Engine, Influencer Engine, and Ads Copilot data product. See PLAN.md for the full roadmap.

• //Model a channel as a first class object: cold outreach, influencer, ads, organic social, referral.
• //Roll up pipeline value and conversion rate per channel so the founder can see what actually works.
• //Feed channel performance back into scoreLead as a signal (a channel that converts well should score its leads higher).
• //Add a simple weekly plan view: which channel gets attention this week, matching the Mon to Fri VPS automation scheduler in PLAN.md phase 4.