Adds tooling/econ-sim — a standalone Rust binary for the Phase 2 economics simulation: Layer 1 (Leontief production, #806): - Deterministic per-run PRNG seeding of corp×site productivity (D-176) - Fixed-coefficient production chains; scarcity cascades downstream (D-178) - Per-capita population demand for finals and services - Gate-energy demand reduction for fusion_fuel at connected nodes (D-186) - Price adjustment via local tâtonnement Layer 2 (spatial price equilibrium, #807): - Damped tâtonnement trade flows along gate links (α=0.03, β=0.4, D-178) - 8% transport cost per hop damps long-distance arbitrage - Flows computed from pre-step snapshot; applied atomically - --stability-check implements D-179 Tests 1 and 2: · Test 1: cold-start convergence ±5% at tick 100 → PASS (max 1.05%) · Test 2: long-run stability ±2% over ticks 900–999 → PASS (max 0.00%) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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