add boss wave counter and countdown to the title bar

src/lib/sim/Simulation.cpp

@@ -532,6 +532,16 @@ double Simulation::threatLevel() const
     return m_waveSystem->threatLevel();
 }
 
+int Simulation::bossWaveCounter() const
+{
+    return m_waveSystem->bossWaveCounter();
+}
+
+Tick Simulation::bossCountdownTicks() const
+{
+    return m_waveSystem->bossCountdownTicks();
+}
+
 int Simulation::schematicLevel(const std::string& shipId) const
 {
     const std::map<std::string, SchematicState>::const_iterator it =

src/lib/sim/Simulation.h

@@ -57,6 +57,8 @@ public:
     int    buildingBlocksStock()  const;
     bool   isGameOver()           const;
     double threatLevel()          const;
+    int    bossWaveCounter()      const;
+    Tick   bossCountdownTicks()   const;
 
     // Schematic state queries.
     int  schematicLevel(const std::string& shipId)    const;

src/lib/sim/WaveSystem.cpp

@@ -100,6 +100,16 @@ int WaveSystem::generation() const
     return m_generation;
 }
 
+int WaveSystem::bossWaveCounter() const
+{
+    return m_bossWaveCounter;
+}
+
+Tick WaveSystem::bossCountdownTicks() const
+{
+    return m_bossCountdownTicks;
+}
+
 // ---------------------------------------------------------------------------
 // Private helpers
 // ---------------------------------------------------------------------------

src/lib/sim/WaveSystem.h

@@ -40,6 +40,12 @@ public:
     // incremented by 1 after each push — REQ-PSH-STATION-STATS).
     int generation() const;
 
+    // Boss wave counter (REQ-WAV-BOSS-COUNTER): current cycle number, starts at 1.
+    int bossWaveCounter() const;
+
+    // Ticks remaining until the next boss wave fires (REQ-WAV-BOSS-COUNTDOWN).
+    Tick bossCountdownTicks() const;
+
 private:
     struct SpawnEntry
     {