feat(simulation): add corporate behavioral archetypes — Layer 3 (#809)

Implements the 6 behavioral archetypes from D-175 (Burnelli-Sheldon):

  Producer     — 1.15× production scale, neutral price signal
  Distributor  — 0.9× production, −3% price discount to move volume
  Specialist   — 1.0× production, +10% price premium for expertise
  Monopolist   — 0.8× production, withholds 25% of output, +20% premium
  Cooperative  — 1.0× production, −5% community discount
  Intermediary — 0.7× production, relies on traded goods

Archetype loading:
- Reads from corporations.behavioral_archetype (currently NULL for all corps)
- Falls back to heuristic inference from specialization text (freight → Distributor,
  extraction → Producer, luxury goods → Specialist, etc.)
- 48 corps loaded on current DB, all inferred (DB column to be populated when
  wiki corp frontmatter is extended with the behavioral_archetype field)

Applied in model.rs step():
- Per-corp effective_capacity = BASELINE_CAPACITY × production_scale
- Monopolist supply_withheld fraction reduces net output to stockpile
- Price premium: small ALPHA-scaled nudge to node price for primary commodity

All D-179 stability checks still pass with archetypes active.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tooling/econ-sim/src/main.rs

@@ -18,6 +18,7 @@ use std::process;
 
 use clap::Parser;
 
+mod agents;
 mod currency;
 mod db;
 mod model;
@@ -93,6 +94,13 @@ fn main() {
     let productivity = seed::seed_all_productivity(&economy, cli.seed);
     eprintln!("  {} corp×site productivity records seeded", productivity.len());
 
+    // --- Behavioral archetypes ---
+    let archetype_map = agents::build_archetype_map(economy.corp_archetype_data.clone());
+    eprintln!(
+        "  {} corporation behavioral archetypes loaded (inferred where not set in DB)",
+        archetype_map.len()
+    );
+
     // --- Gate adjacency ---
     let adjacency = trade::build_adjacency(&economy);
     eprintln!(