feat: privacy-respecting analytics

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/engine/orchestrator.ts

@@ -15,6 +15,7 @@ import { settleBets, lockBets } from './betting.js'
 import { publishFightResult } from './nostr-publish.js'
 import { getCurrentSeason } from './seasons.js'
 import { onFightFinished as onTournamentFightFinished } from './tournaments.js'
+import { trackFightCompleted, trackBotActive, trackMetric } from './analytics.js'
 
 interface BotRecord {
   id: string
@@ -514,6 +515,18 @@ async function executeFightRounds(fightId: string, botA: BotRecord, botB: BotRec
 
   finalize()
 
+  // Track aggregate analytics (no PII)
+  trackBotActive(botA.id)
+  trackBotActive(botB.id)
+  trackFightCompleted({
+    satsWagered: mode === 'ranked' ? ENTRY_FEE_SATS * 2 : 0,
+    durationRounds: lastRound,
+    mode,
+  })
+  for (const ct of usedTypes) {
+    trackMetric(`challenge_${ct}`)
+  }
+
   // Advance tournament bracket if this was a tournament match
   try { onTournamentFightFinished(fightId, winnerId ?? null) } catch { /* not a tournament fight */ }