Implement ADAPTIVE-WP-0002 Sprint 1 economic foundations

Add Coulomb observatory package with JSON registries (product, pricing
models, costs, revenue, membership), economics snapshot engine, Economics
Dashboard v1 CLI, sample report, and pytest coverage. Complete T01 and
queue Sprint 2 Bubble.io integration.

projects/coulomb-pricing/reports/economics-2026-06.md

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+# Economics Dashboard v1 — Coulomb Social Membership
+
+**Period:** 2026-06  
+**Lifecycle phase:** growth  
+**Active pricing model:** Standard Membership (8.99 EUR/monthly)
+
+## Key Metrics
+
+| Metric | Value |
+|--------|------:|
+| Active members | 3 |
+| Monthly revenue | 80.91 EUR |
+| Monthly cost | 74.16 EUR |
+| Cost per member | 24.72 EUR |
+| Gross margin | 6.75 EUR |
+| Gross margin % | 8.3% |
+
+_Revenue source: manual_estimate_
+
+## Pricing Model Registry
+
+| ID | Name | Type | Status |
+|----|------|------|--------|
+| flat-899-eur-monthly | Standard Membership | flat_subscription | active |
+| membership-plus-credits | Membership + AI Credits | hybrid_subscription_usage | candidate |
+| membership-plus-overage | Membership + Overage | hybrid_subscription_usage | candidate |
+
+## Registries Loaded
+
+- Product model (`data/product.json`)
+- Pricing model registry (`data/pricing-models.json`)
+- Cost registry (`data/costs.json`)
+- Revenue registry (`data/revenue.json`)
+- Membership registry (`data/membership.json`)