Add liquidity tracking, budget, and platform cost history

Restore operator platform costs (Bubble, domains, Stripe) with monthly
history from March 2025 and member payments from November 2025. Track
€1,000 starting budget, cumulative burn, and remaining liquidity in the
economics dashboard. Document LQ requirements in REQUIREMENTS.md.

projects/coulomb-pricing/tests/test_economics.py

@@ -3,10 +3,17 @@ from __future__ import annotations
 from decimal import Decimal
 from pathlib import Path
 
-from observatory.economics import active_members, build_snapshot, monthly_cost_total
+from observatory.economics import (
+    active_members,
+    build_liquidity_summary,
+    build_snapshot,
+    monthly_cost_from_rate_card,
+)
 from observatory.load import (
-    load_costs,
+    load_budget,
+    load_cost_rate_card,
     load_membership,
+    load_monthly_platform_costs,
     load_pricing_models,
     load_product,
     load_revenue,
@@ -20,36 +27,58 @@ def test_active_members_counts_only_active_status() -> None:
     assert active_members(members) == 1
 
 
-def test_build_snapshot_reflects_sole_member_and_zero_costs() -> None:
+def test_rate_card_matches_documented_platform_cost_without_revenue() -> None:
+    rate_card, fx_rates = load_cost_rate_card(DATA_DIR)
+    total = monthly_cost_from_rate_card(rate_card, fx_rates, Decimal("0"), 0)
+    assert total == Decimal("72.20")
+
+
+def test_rate_card_matches_platform_cost_with_one_member() -> None:
+    rate_card, fx_rates = load_cost_rate_card(DATA_DIR)
+    total = monthly_cost_from_rate_card(rate_card, fx_rates, Decimal("8.99"), 1)
+    assert total == Decimal("72.58")
+
+
+def test_build_snapshot_june_2026_shows_liquidity_burn() -> None:
     product = load_product(DATA_DIR)
     models = load_pricing_models(DATA_DIR)
     members = load_membership(DATA_DIR)
     revenue = load_revenue(DATA_DIR)
-    _, costs, fx_rates = load_costs(DATA_DIR)
+    monthly_costs = load_monthly_platform_costs(DATA_DIR)
 
-    snapshot = build_snapshot("2026-06", product, models, members, revenue, costs, fx_rates)
+    snapshot = build_snapshot("2026-06", product, models, members, revenue, monthly_costs)
 
     assert snapshot.active_members == 1
     assert snapshot.monthly_revenue == Decimal("8.99")
-    assert snapshot.revenue_source == "manual"
-    assert snapshot.pricing_model_count == 3
-    assert snapshot.monthly_cost == Decimal("0.00")
-    assert snapshot.cost_per_member == Decimal("0.00")
-    assert snapshot.gross_margin == Decimal("8.99")
-    assert snapshot.gross_margin_pct == Decimal("100.0")
+    assert snapshot.monthly_platform_cost == Decimal("72.58")
+    assert snapshot.period_net_liquidity == Decimal("-63.97")
+    assert snapshot.liquidity_status == "burning"
+    assert snapshot.gross_margin == Decimal("-63.59")
 
 
-def test_monthly_cost_is_zero_with_empty_registry() -> None:
-    _, costs, fx_rates = load_costs(DATA_DIR)
-    total = monthly_cost_total(costs, fx_rates, Decimal("8.99"), 1)
-    assert total == Decimal("0.00")
+def test_liquidity_summary_tracks_budget_burn_through_june_2026() -> None:
+    budget = load_budget(DATA_DIR)
+    revenue = load_revenue(DATA_DIR)
+    monthly_costs = load_monthly_platform_costs(DATA_DIR)
+
+    summary = build_liquidity_summary(budget, revenue, monthly_costs, "2026-06")
+
+    assert summary.initial_budget == Decimal("1000.00")
+    assert summary.cumulative_platform_cost == Decimal("1158.24")
+    assert summary.cumulative_member_payments == Decimal("68.88")
+    assert summary.cumulative_net_liquidity == Decimal("-1089.36")
+    assert summary.remaining_budget == Decimal("-89.36")
+    assert summary.liquidity_status == "burning"
+    assert summary.months_tracked == 16
 
 
-def test_dashboard_module_renders_markdown() -> None:
+def test_dashboard_renders_liquidity_sections() -> None:
     from observatory.dashboard import generate_dashboard
 
     report = generate_dashboard(DATA_DIR, "2026-06")
-    assert "# Economics Dashboard v1" in report
-    assert "Pricing Model Registry" in report
-    assert "flat-899-eur-monthly" in report
-    assert "Active members | 1" in report
+    assert "Liquidity & Budget" in report
+    assert "Monthly History" in report
+    assert "2025-03" in report
+    assert "2025-11" in report
+    assert "remaining budget" not in report.lower() or "Remaining budget" in report
+    assert "-89.36" in report