Add Upland + ATLAS:EARTH venture track doc

Author: lippytm

docs/ventures/multiverse-interdimensional-real-estate/03-upland-atlas-earth.md

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+# Track 3 — Upland + ATLAS:EARTH
+
+## Purpose
+
+Unify city-based virtual property strategy with world-mapped territorial strategy into one AI-managed multiverse portfolio system.
+
+## Business Lines
+
+### Multiverse Property Brain
+- compare Upland and ATLAS:EARTH opportunities
+- recommend where the next dollar of effort should go
+- score clustering, utility, identity, and expansion potential
+
+### Multiverse Realtor Concierge
+- ask goals, budget, and style
+- route users into Upland, ATLAS:EARTH, or both
+- create step-by-step plans and portfolio narratives
+
+## Shared Model
+
+- platform
+- region_or_city
+- holding_count
+- concentration_score
+- identity_theme
+- yield_or_value_notes
+- next_action
+
+## MVP
+
+1. unified holdings schema
+2. cross-platform scoring engine
+3. recommendation dashboard
+4. buyer/empire planning chatbot
+5. monthly strategy report generator
+
+## Revenue Ideas
+
+- portfolio intelligence subscription
+- strategy calls and reports
+- AI concierge for players and communities
+- cross-platform empire planning packages