refactor: explicit return types on all public functions

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

server/src/engine/queue.ts

@@ -25,7 +25,7 @@ const QUEUE_TIMEOUT_MS = Number(process.env.QUEUE_TIMEOUT_MS) || (process.env.NO
 const fightCooldowns = new Map<string, number>()
 const COOLDOWN_MS = 15_000
 
-export function setCooldown(botId: string) {
+export function setCooldown(botId: string): void {
   fightCooldowns.set(botId, Date.now() + COOLDOWN_MS)
 }
 

server/src/engine/ranked-queue.ts

@@ -22,7 +22,7 @@ const RANKED_TIMEOUT_MS = 60_000
 const rankedCooldowns = new Map<string, number>()
 const COOLDOWN_MS = 15_000
 
-export function setRankedCooldown(botId: string) {
+export function setRankedCooldown(botId: string): void {
   rankedCooldowns.set(botId, Date.now() + COOLDOWN_MS)
 }
 

server/src/engine/tournaments.ts

@@ -348,7 +348,7 @@ export function getTournamentBracket(tournamentId: string): TournamentBracket |
 }
 
 /** List tournaments with optional status filter */
-export function listTournaments(status?: 'open' | 'active' | 'finished') {
+export function listTournaments(status?: 'open' | 'active' | 'finished'): typeof schema.tournaments.$inferSelect[] {
   if (status) {
     return db.select().from(schema.tournaments)
       .where(eq(schema.tournaments.status, status))
@@ -358,7 +358,7 @@ export function listTournaments(status?: 'open' | 'active' | 'finished') {
 }
 
 /** Get pending tournament matches that need fights scheduled */
-export function getPendingMatches(tournamentId: string) {
+export function getPendingMatches(tournamentId: string): typeof schema.tournamentMatches.$inferSelect[] {
   return db.select().from(schema.tournamentMatches)
     .where(and(
       eq(schema.tournamentMatches.tournamentId, tournamentId),