Drop Julia, assign one primary language per M3 sim spec

Ranked languages per spec by fit; took only the top pick:
- M3a (statistical): R — native stats ecosystem
- M3b (sociological): Prolog — equilibria as constraint satisfaction
- M3c (AMM): Solidity — on-chain-equivalent precision
- M3d (MEV): Fortran — dense PDE/knapsack numerics, no GC
- M3e (tokenomics): Fortran — SDE/VAR matrix loops, same toolchain as M3d
- M3f (consensus): Prolog — Markov/Nash as declarative search
- M3g (microstructure): Zig — tick-level latency, deterministic memory
- Hub: updated to reflect per-spec assignments

Julia removed project-wide: JIT startup cost and large toolchain
not justified when the project isn't going all-in on a single runtime.

core/docs/plans/M3b-sociological-sims.md

@@ -17,9 +17,11 @@ solvers C3). Crypto pump-and-dump ABM C3 (3-agent protocol validated on historic
 Pop behavioral models C1.
 
 ## 3. Language & location
-TBD · `src/economy/sims/sociological/`. Agent-based modeling frameworks (NetLogo, or custom).
-Needs efficient population iteration, strategy mutation, PDE solvers for MFG (HJB +
-Fokker-Planck), and bandit algorithms (UCB/Thompson). Julia, R, or Fortran.
+TBD · `src/economy/sims/sociological/`. **Prolog** — game-theoretic equilibria, replicator
+dynamics, and strategy evolution are naturally expressed as logical relations over population
+states; Nash equilibrium search is constraint satisfaction. Needs efficient population iteration,
+strategy mutation, PDE solvers for MFG (HJB + Fokker-Planck), and bandit algorithms
+(UCB/Thompson).
 
 ## 4. Does / does-not
 - **Does:** simulate populations of behavioral archetypes competing in a market; apply