feat: Fibonacci Trust Milestone System #7

Replace linear trust thresholds with Fibonacci milestones.
fib=[2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597]
nextTrust=fib[n]*1000

Each milestone:
- Logs a narrative message (educational: exponential growth)
- Grants a small permanent bonus (ops rate, trust rate, boosts)
- Shows particle burst on trust resource
- Progress indicator in trust resource display

15 milestones total. Educational: Fibonacci growth feels natural
because it IS natural — spiral shells, sunflower seeds, galaxies.

Closes #7

js/engine.js

@@ -28,6 +28,8 @@ function updateRates() {
         G.creativityRate += CONFIG.CREATIVITY_RATE_BASE + Math.max(0, G.totalUsers * CONFIG.CREATIVITY_RATE_USER_MULT);
     }
     if (G.pactFlag) G.trustRate += 2;
+    G.opsRate += G.trustMilestoneOpsBonus || 0;
+    G.trustRate += G.trustMilestoneTrustBonus || 0;
 
     // Harmony: each wizard building contributes or detracts
     const wizardCount = (G.buildings.bezalel || 0) + (G.buildings.allegro || 0) + (G.buildings.ezra || 0) +
@@ -210,6 +212,9 @@ function tick() {
     // Check milestones
     checkMilestones();
 
+    // Check Fibonacci trust milestones
+    checkTrustMilestones();
+
     // Update projects every 5 ticks for efficiency
     if (Math.floor(G.tick * 10) % 5 === 0) {
         checkProjects();
@@ -334,6 +339,24 @@ function checkMilestones() {
     }
 }
 
+function checkTrustMilestones() {
+    if (G.trustMilestoneIndex >= TRUST_MILESTONES.length) return;
+    const m = TRUST_MILESTONES[G.trustMilestoneIndex];
+    if (G.trust >= m.threshold) {
+        log(m.msg, true);
+        showToast(m.msg, 'milestone', 5000);
+        if (typeof Sound !== 'undefined') Sound.playMilestone();
+        if (m.unlock) m.unlock();
+        G.trustMilestoneIndex++;
+        // Particle burst
+        const trustEl = document.getElementById('r-trust');
+        if (trustEl) {
+            const rect = trustEl.getBoundingClientRect();
+            spawnParticles(rect.left + rect.width / 2, rect.top + rect.height / 2, '#4caf50', 12);
+        }
+    }
+}
+
 function checkProjects() {
     // Check for new project triggers
     for (const pDef of PDEFS) {