Validate and integrate fleet intelligence features

Fix atlas skip merge under lock, tolerate post-auth WS frames in tests,
and harden test-suite npm invocation on Windows.

agent/client/strategy_policy.go

@@ -47,8 +47,8 @@ func (c *AgentClient) applyAdaptiveStrategyJSON(raw json.RawMessage) {
 		policy.SkipTiers = skip
 	}
 	c.tierPolicy = policy
+	c.mergeAtlasSkipsIntoPolicyLocked()
 	c.mu.Unlock()
-	c.mergeAtlasSkipsIntoPolicy()
 	log.Printf("[agent] adaptive strategy applied (%d tiers, confidence=%.2f)", len(s.TierOrder), s.Confidence)
 }