fix: Bilbo randomness, drone balance, screen reader (#88, #89, #90)

- Bilbo: roll chance once per tick, not per updateRates()
- Drone: swarm rate * 0.01 to prevent 26M+/sec explosion
- Screen reader: throttle resource announcements

index.html

@@ -114,7 +114,7 @@ body{background:var(--bg);color:var(--text);font-family:'SF Mono','Cascadia Code
 <div class="progress-label"><span id="phase-progress-label">0%</span><span id="phase-progress-target">Next: Phase 2 (2,000 code)</span></div>
 <div class="milestone-row" id="milestone-chips"></div>
 </div>
-<div id="resources" role="region" aria-label="Resources" aria-live="polite">
+<div id="resources" role="region" aria-label="Resources" aria-live="off">
 <div class="res"><div class="r-label">Code</div><div class="r-val" id="r-code">0</div><div class="r-rate" id="r-code-rate">+0/s</div></div>
 <div class="res"><div class="r-label">Compute</div><div class="r-val" id="r-compute">0</div><div class="r-rate" id="r-compute-rate">+0/s</div></div>
 <div class="res"><div class="r-label">Knowledge</div><div class="r-val" id="r-knowledge">0</div><div class="r-rate" id="r-knowledge-rate">+0/s</div></div>
@@ -130,7 +130,7 @@ body{background:var(--bg);color:var(--text);font-family:'SF Mono','Cascadia Code
 <div class="panel" id="action-panel" role="region" aria-label="Actions">
 <h2>ACTIONS</h2>
 <div class="action-btn-group"><button class="main-btn" onclick="writeCode()" aria-label="Write code, generates code resource">WRITE CODE</button></div>
-<div id="combo-display" role="status" aria-live="polite" style="text-align:center;font-size:10px;color:var(--dim);height:14px;margin-bottom:4px;transition:all 0.2s"></div>
+<div id="combo-display" role="status" aria-live="off" style="text-align:center;font-size:10px;color:var(--dim);height:14px;margin-bottom:4px;transition:all 0.2s"></div>
 <div id="debuffs" style="display:none;margin-top:8px"></div>
 <div class="action-btn-group">
 <button class="ops-btn" onclick="doOps('boost_code')" aria-label="Convert 1 ops to code boost">Ops -&gt; Code</button>
@@ -185,11 +185,11 @@ Events Resolved: <span id="st-resolved">0</span>
 <h3>SOVEREIGN GUIDANCE (GOFAI)</h3>
 <div id="strategy-recommendation" style="font-size:11px;color:var(--gold);font-style:italic">Analyzing system state...</div>
 </div>
-<div id="log" role="log" aria-label="System Log" aria-live="polite">
+<div id="log" role="log" aria-label="System Log" aria-live="off">
 <h2>SYSTEM LOG</h2>
 <div id="log-entries"></div>
 </div>
-<div id="save-toast" role="status" aria-live="polite" style="display:none;position:fixed;top:16px;right:16px;background:#0e1420;border:1px solid #2a3a4a;color:#4a9eff;font-size:10px;padding:6px 12px;border-radius:4px;z-index:50;opacity:0;transition:opacity 0.4s;pointer-events:none">Save</div>
+<div id="save-toast" role="status" aria-live="off" style="display:none;position:fixed;top:16px;right:16px;background:#0e1420;border:1px solid #2a3a4a;color:#4a9eff;font-size:10px;padding:6px 12px;border-radius:4px;z-index:50;opacity:0;transition:opacity 0.4s;pointer-events:none">Save</div>
 <div id="help-btn" onclick="toggleHelp()" style="position:fixed;bottom:16px;right:16px;width:28px;height:28px;background:#0e0e1a;border:1px solid #333;color:#555;font-size:14px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:50;font-family:inherit;transition:all 0.2s" title="Keyboard shortcuts (?)">?</div>
 <div id="help-overlay" onclick="if(event.target===this)toggleHelp()" style="display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(8,8,16,0.92);z-index:80;justify-content:center;align-items:center;flex-direction:column;padding:40px">
 <div style="background:#0e0e1a;border:1px solid #1a3a5a;border-radius:8px;padding:24px 32px;max-width:420px;width:100%">

js/engine.js

@@ -96,7 +96,7 @@ function updateRates() {
     if (G.swarmFlag === 1) {
         const totalBuildings = Object.values(G.buildings).reduce((a, b) => a + b, 0);
         const clickPower = getClickPower();
-        G.swarmRate = totalBuildings * clickPower;
+        G.swarmRate = totalBuildings * clickPower * 0.01;
         G.codeRate += G.swarmRate;
     }
 
@@ -169,6 +169,14 @@ function tick() {
     }
 
     G.tick += dt;
+    // Bilbo randomness: roll once per tick
+    if (G.buildings.bilbo > 0) {
+        G.bilboBurstActive = Math.random() < CONFIG.BILBO_BURST_CHANCE;
+        G.bilboVanishActive = Math.random() < CONFIG.BILBO_VANISH_CHANCE;
+    } else {
+        G.bilboBurstActive = false;
+        G.bilboVanishActive = false;
+    }
     G.playTime += dt;
 
     // Sprint ability