test: 10-round double timeout simulation — draw, equal HP, no loops

Simulates both bots timing out every round for 10 rounds. Verifies
zero damage per round, HP unchanged at 200, draw outcome.

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

server/src/engine/edge-cases.test.ts

@@ -242,3 +242,36 @@ describe('challenge type rotation', () => {
     expect(usedTypes.has(remaining.type)).toBe(false)
   })
 })
+
+describe('10-round double timeout simulation', () => {
+  it('both bots timeout every round: fight ends as draw, equal HP, no infinite loop', () => {
+    const STARTING_HP = 200
+    const MAX_ROUNDS = 10
+    let hpA = STARTING_HP
+    let hpB = STARTING_HP
+    let winnerId: string | null = null
+
+    for (let round = 1; round <= MAX_ROUNDS; round++) {
+      const ch = makeChallenge()
+      const result = scoreRound(
+        ch, botA, botB,
+        resp(null, 8000, { timedOut: true }),
+        resp(null, 8000, { timedOut: true }),
+        null, 0, 0,
+      )
+      // Both timeout → zero damage, zero scores, no winner
+      expect(result.winnerId).toBeNull()
+      expect(result.botADamage).toBe(0)
+      expect(result.botBDamage).toBe(0)
+      hpA -= result.botBDamage // damage TO A = B's damage output
+      hpB -= result.botADamage // damage TO B = A's damage output
+    }
+
+    // After 10 rounds of double timeout: HP unchanged, draw
+    expect(hpA).toBe(STARTING_HP)
+    expect(hpB).toBe(STARTING_HP)
+    // Determine winner: equal HP → null (draw)
+    winnerId = hpA > hpB ? 'a1' : hpB > hpA ? 'b1' : null
+    expect(winnerId).toBeNull()
+  })
+})