feat(dynasty): add legitimacy signal from chronicle events

src/sim/Dynasty.ts

@@ -599,6 +599,29 @@ export function applyForeignClaimantDiplomacy(victim: Empire, backer: Empire, ti
   addRelationModifier(relBetween(victim, backer.id), { ...mod });
 }
 
+// ── Dynasty legitimacy ────────────────────────────────────────────────────────────
+
+const LEGITIMACY_POSITIVE: ReadonlySet<string> = new Set(["heir-born", "succession", "dynasty-restored", "dynastic-marriage"]);
+const LEGITIMACY_NEGATIVE: ReadonlySet<string> = new Set(["heir-died", "succession-crisis", "pretender-revolt", "dynasty-extinct"]);
+
+/** Derive a [-1, 1] legitimacy score from recent dynasty chronicle events.
+ *  Positive events (smooth successions, heir births, marriages) push toward +1.
+ *  Negative events (crises, revolts, heir deaths) push toward -1.
+ *  Returns 0 for dynasties with no chronicle yet. */
+export function dynastyLegitimacy(state: GalaxyState, dynastyId: Id | undefined): number {
+  if (!dynastyId || !state.dynasties || !state.events) return 0;
+  const dyn = state.dynasties[dynastyId];
+  if (!dyn || dyn.historicalEventIds.length === 0) return 0;
+  let score = 0;
+  for (const eid of dyn.historicalEventIds) {
+    const ev = state.events[eid];
+    if (!ev) continue;
+    if (LEGITIMACY_POSITIVE.has(ev.type)) score++;
+    else if (LEGITIMACY_NEGATIVE.has(ev.type)) score--;
+  }
+  return Math.max(-1, Math.min(1, score / dyn.historicalEventIds.length));
+}
+
 // ── Dynasty chronicle helpers ─────────────────────────────────────────────────────
 
 const DYNASTY_HISTORY_LIMIT = 12;
@@ -796,8 +819,12 @@ function heirDies(state: GalaxyState, emp: Empire, rng: PRNG): void {
 }
 
 function maybePretenderRevolt(state: GalaxyState, emp: Empire, rng: PRNG): void {
-  // Only shaky realms breed open revolt.
-  if (emp.cohesion > 0.55) return;
+  // Legitimacy shifts the revolt threshold: a dynasty with a strong positive chronicle
+  // requires deeper instability before a pretender dares rise (threshold falls to 0.45),
+  // while a dynasty with a troubled recent history is vulnerable even at higher cohesion (up to 0.65).
+  const legit = dynastyLegitimacy(state, emp.dynastyId);
+  const revoltThreshold = 0.55 - legit * 0.10;
+  if (emp.cohesion > revoltThreshold) return;
   const { person, reason } = findOrMakePretender(state, emp, rng);
   const cap = state.systems[emp.capitalSystemId];
   emp.cohesion = Math.max(0.1, emp.cohesion - 0.05);

src/sim/Headless.ts

@@ -3,7 +3,7 @@ import { SeededRandom } from "./Random";
 import { generateGalaxy } from "./Galaxy";
 import { executeTick } from "./Tick";
 import { ensureArtifactObjects } from "./Artifacts";
-import { lineageChain } from "./Dynasty";
+import { lineageChain, dynastyLegitimacy } from "./Dynasty";
 import { summarizeGrievances } from "./Relations";
 
 export interface Tally {
@@ -110,9 +110,11 @@ function snapshotMetrics(state: GalaxyState, originalIds: Set<Id>) {
   const shipsByRole: Record<string, number> = {};
   for (const f of Object.values(state.fleets)) if (f.role) shipsByRole[f.role] = (shipsByRole[f.role] ?? 0) + 1;
   const topDynasty = Object.values(dynasties).filter(d => d.extinctTick === undefined).sort((a, b) => b.prestige - a.prestige)[0] ?? null;
+  const topDynastyLegit = topDynasty ? dynastyLegitimacy(state, topDynasty.id) : 0;
   const grievances = summarizeGrievances(state);
   return {
     grievances,
+    topDynastyLegit,
     shipsByRole,
     topDynasty,
     factionsActive: factionList.length,
@@ -204,7 +206,7 @@ export function runHeadlessStats(settings: SimSettings, milestones: number[] = [
         `- Subjects: ${m.subjects} active${m.subjects ? ` (${Object.entries(m.subjectsByStatus).map(([k, n]) => `${n} ${k}`).join(", ")})` : ""} · ${cumulative.subjectsCreated} created · ${cumulative.subjectRebellions} rebellions · ${cumulative.subjectIntegrations} integrations · ${cumulative.subjectLiberations} liberations`,
         `- Quests: ${cumulative.questsLaunched} launched · ${cumulative.questsCompleted} completed`,
         `- Specialist ships: ${Object.keys(m.shipsByRole).length ? Object.entries(m.shipsByRole).map(([r, n]) => `${n} ${r}`).join(", ") : "none"} active`,
-        `- Careers: ${cumulative.promotions} promotions · ${cumulative.falls} falls · top house: ${m.topDynasty ? `${m.topDynasty.name} (prestige ${m.topDynasty.prestige.toFixed(0)})` : "none"}`,
+        `- Careers: ${cumulative.promotions} promotions · ${cumulative.falls} falls · top house: ${m.topDynasty ? `${m.topDynasty.name} (prestige ${m.topDynasty.prestige.toFixed(0)}, legitimacy ${m.topDynastyLegit >= 0 ? "+" : ""}${m.topDynastyLegit.toFixed(2)})` : "none"}`,
         ``,
       );
       lastFounded = cumulative.founded;

src/ui/InspectorPanel.tsx

@@ -3,7 +3,7 @@ import type { ArtifactKind, GalaxyState, Id, Empire, Person, EmpireAdjustablePro
 import { SHIP_ROLES, SHIP_ROLE_SPEC } from "../sim/ShipRoles";
 import { MOOD_LABEL, MOOD_COLOR, IDEOLOGY_LABEL, IDEOLOGY_COLOR, rulerDisplayName } from "../sim/Moods";
 import { ROLE_LABEL, TRAIT_LABEL } from "../sim/Characters";
-import { lineageChain, livingDynastyCount, dynastyMembers, personDisplayName } from "../sim/Dynasty";
+import { lineageChain, livingDynastyCount, dynastyMembers, personDisplayName, dynastyLegitimacy } from "../sim/Dynasty";
 import { GOVERNMENT_LABEL, PLANET_TAG_LABEL } from "../sim/Galaxy";
 import { ARTIFACT_LABEL } from "../sim/Artifacts";
 import { SUBJECT_STATUS_LABEL, subjectOf, subjectsOf } from "../sim/Subjects";
@@ -155,19 +155,28 @@ function LineageSection({ snapshot, emp }: { snapshot: Readonly<GalaxyState>; em
           </span>
         </div>
       )}
-      {dynasty && dynasty.historicalEventIds.length > 0 && (
-        <>
-          <h4 style={{ marginTop: 6, marginBottom: 3, opacity: 0.85 }}>Dynasty Chronicle</h4>
-          {[...dynasty.historicalEventIds].reverse().slice(0, 5).map(eid => {
-            const ev = snapshot.events[eid];
-            return ev ? (
-              <div key={eid} className="event-mini" style={{ borderLeft: `3px solid ${dynastyEventColor(ev.type)}`, paddingLeft: 5, marginBottom: 2 }}>
-                <span style={{ opacity: 0.55, fontSize: 9 }}>t{ev.tick} </span>{ev.title}
-              </div>
-            ) : null;
-          })}
-        </>
-      )}
+      {dynasty && dynasty.historicalEventIds.length > 0 && (() => {
+        const legit = dynastyLegitimacy(snapshot, emp.dynastyId);
+        const legitLabel = legit > 0.3 ? "Stable" : legit > -0.3 ? "Contested" : "Fragile";
+        const legitColor = legit > 0.3 ? "rgba(120,220,140,0.9)" : legit > -0.3 ? "rgba(220,200,100,0.9)" : "rgba(220,80,60,0.9)";
+        return (
+          <>
+            <div className="info-row">
+              <span>Legitimacy</span>
+              <span style={{ color: legitColor, fontWeight: 600 }}>{legitLabel}</span>
+            </div>
+            <h4 style={{ marginTop: 6, marginBottom: 3, opacity: 0.85 }}>Dynasty Chronicle</h4>
+            {[...dynasty.historicalEventIds].reverse().slice(0, 5).map(eid => {
+              const ev = snapshot.events[eid];
+              return ev ? (
+                <div key={eid} className="event-mini" style={{ borderLeft: `3px solid ${dynastyEventColor(ev.type)}`, paddingLeft: 5, marginBottom: 2 }}>
+                  <span style={{ opacity: 0.55, fontSize: 9 }}>t{ev.tick} </span>{ev.title}
+                </div>
+              ) : null;
+            })}
+          </>
+        );
+      })()}
     </>
   );
 }