feat(simulation): add EconEvent stub and import currency zones from TOML

Add D-180 EconEvent struct (target, effect, duration, visibility enums)
with no-op handler to satisfy #809 spec. Import MARK_PRIMARY and MIXED
currency zone assignments from wiki/economics/currency_zones.toml (D-172).
All four D-179 stability tests now pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tooling/econ-sim/src/agents.rs

@@ -18,6 +18,61 @@
 
 use std::collections::HashMap;
 
+// ---------------------------------------------------------------------------
+// EconEvent — D-180 event port stub (#809)
+// ---------------------------------------------------------------------------
+
+/// Scope of nodes affected by an EconEvent.
+#[derive(Debug, Clone)]
+#[allow(dead_code)]
+pub enum EventTarget {
+    Node(String),
+    NodeSet(Vec<String>),
+    Corridor(String),
+    TradeRoute { from: String, to: String },
+    Currency(String),
+    Commodity(String),
+}
+
+/// Economic effect applied at the target.
+#[derive(Debug, Clone)]
+#[allow(dead_code)]
+pub enum EventEffect {
+    ProductivityMultiplier(f64),
+    CapacityMultiplier(f64),
+    DemandShock(f64),
+    ExchangeShock(f64),
+}
+
+/// Who can observe this event.
+#[derive(Debug, Clone)]
+#[allow(dead_code)]
+pub enum EventVisibility {
+    Global,
+    Proximate(u32),           // hops
+    Disclosed(Vec<String>),   // specific node IDs
+    Hidden,
+}
+
+/// Economic event for injection into the simulation (D-180).
+///
+/// No-op handler until the IPC bridge is in place.
+#[derive(Debug, Clone)]
+#[allow(dead_code)]
+pub struct EconEvent {
+    pub target: EventTarget,
+    pub effect: EventEffect,
+    /// Duration in simulation ticks. 0 = instantaneous.
+    pub duration: u32,
+    pub visibility: EventVisibility,
+}
+
+/// No-op event handler. Called from the tick loop once D-180 IPC is wired.
+#[allow(dead_code)]
+pub fn handle_event(_event: &EconEvent) {
+    // No-op: event port not yet connected (D-180).
+}
+
 // ---------------------------------------------------------------------------
 // Archetype enum
 // ---------------------------------------------------------------------------

tooling/economy-db/import_economics.py

@@ -254,17 +254,44 @@ def import_chains(conn: sqlite3.Connection, dry_run: bool) -> tuple[int, int]:
 # ---------------------------------------------------------------------------
 
 def set_currency_zones(conn: sqlite3.Connection, dry_run: bool) -> dict:
-    """Set currency_zone on star_systems. Default TRACTUS_PRIMARY, Sol = MIXED."""
+    """Set currency_zone on star_systems from wiki/economics/currency_zones.toml.
+
+    Default: TRACTUS_PRIMARY. Sol (GJ 0): MIXED (set before file is read).
+    MARK_PRIMARY and MIXED assignments come from the TOML file (D-172).
+    """
     if dry_run:
-        return {"TRACTUS_PRIMARY": "all", "MIXED": "GJ 0"}
+        return {"TRACTUS_PRIMARY": "all", "MIXED": "GJ 0 + toml"}
 
     # Default everything to TRACTUS_PRIMARY
-    conn.execute("UPDATE star_systems SET currency_zone = 'TRACTUS_PRIMARY' WHERE currency_zone IS NULL")
+    conn.execute("UPDATE star_systems SET currency_zone = 'TRACTUS_PRIMARY'")
 
-    # Sol system is MIXED (Earth legacy currency presence)
+    # Sol system is MIXED (Earth legacy currency presence — set before TOML load)
     conn.execute("UPDATE star_systems SET currency_zone = 'MIXED' WHERE system_id = 'GJ 0'")
 
-    # Future: Compact systems → MARK_PRIMARY (requires authored Compact membership data)
+    # Load MARK_PRIMARY and MIXED assignments from authored TOML (D-172)
+    zones_path = REPO_ROOT / "wiki" / "economics" / "currency_zones.toml"
+    if zones_path.exists():
+        import tomllib  # Python 3.11+
+
+        with open(zones_path, "rb") as f:
+            zones = tomllib.load(f)
+
+        mark_ids = [entry["system_id"] for entry in zones.get("mark_primary", [])]
+        mixed_ids = [entry["system_id"] for entry in zones.get("mixed", [])]
+
+        for sid in mark_ids:
+            conn.execute(
+                "UPDATE star_systems SET currency_zone = 'MARK_PRIMARY' WHERE system_id = ?",
+                (sid,),
+            )
+        for sid in mixed_ids:
+            conn.execute(
+                "UPDATE star_systems SET currency_zone = 'MIXED' WHERE system_id = ?",
+                (sid,),
+            )
+    else:
+        print("        warning: wiki/economics/currency_zones.toml not found — "
+              "all systems default to TRACTUS_PRIMARY / Sol to MIXED")
 
     counts = {}
     for row in conn.execute("SELECT currency_zone, COUNT(*) FROM star_systems GROUP BY currency_zone"):