feat(evolver): update retirement ticker interval to daily (§10.8)

Changed RetirementCheckInterval from 1 hour to 24 hours to align
with the 7-day low-rating rule specified in §10.8. The retirement
automation is already fully implemented:

- startRetirementTicker: runs periodic checks (now daily)
- EnforcePolicy: retires bots below rating threshold (800) for 7
  consecutive days, enforces 50-bot population cap
- queryConsecutiveLowRating: uses rating_history table to track
  consecutive days below threshold
- RetireBot: handles K8s manifest deletion via declarative-config
- TestEnforcePolicy_CapEnforcement: integration test for cap enforcement

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

cmd/acb-evolver/run.go

@@ -96,7 +96,7 @@ func DefaultRunConfig() RunConfig {
 		RatingThreshold:         800.0,
 		PopCap:            50,
 		CycleInterval:          5 * time.Minute,
-		RetirementCheckInterval: 1 * time.Hour,
+		RetirementCheckInterval: 24 * time.Hour,
 		IslandCooldown:    2 * time.Minute,
 		LLMURL:            envOrDefault("ACB_LLM_URL", "http://zai-proxy-apexalgo.tail1b1987.ts.net:8080"),
 		RepoDir:           envOrDefault("ACB_REPO_DIR", "."),