Add thread-safety to Truthiness algorithm statistics tracking

[Copilot]

The Truthiness algorithm accumulates statistics in mutable member variables from a const process() method, creating race conditions when called concurrently from multiple threads.

Changes

• m_event_count: Changed from uint64_t to std::atomic<uint64_t> for lock-free atomic operations
• m_stats_mutex: Added mutex to protect m_average_truthiness updates during the online average calculation
• Accessors: getAverageTruthiness() now locks, getEventCount() uses atomic .load()

// In process()
{
  std::lock_guard<std::mutex> lock(m_stats_mutex);
  m_event_count++;
  m_average_truthiness += (truthiness - m_average_truthiness) / m_event_count;
}

Pattern follows existing thread-safe implementations in the codebase (e.g., UniqueIDGenSvc).

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[github-actions]

Capybara summary for PR 2179

• rec_dis_10x100_minQ2=0_craterlake_10x100
• rec_dis_10x100_minQ2=1000_craterlake_tracking_only
• rec_dis_18x275_minQ2=0_craterlake_18x275
• rec_dis_18x275_minQ2=0_craterlake_18x275_MT
• rec_dis_18x275_minQ2=0_craterlake_18x275_ST_MT
• rec_dis_18x275_minQ2=1000_craterlake_18x275
• rec_dis_18x275_minQ2=1000_craterlake_18x275_MT
• rec_dis_18x275_minQ2=1000_craterlake_18x275_ST_MT
• rec_dis_5x41_minQ2=0_craterlake_5x41
• rec_e_1GeV_20GeV_craterlake
• rec_pi_1GeV_20GeV_craterlake

Last updated 2025-11-07T19:07-05:00 aa0f84d