fix: propagate isGreen through dedup flush to support windowed aggregation

dedupAggrShard.flush always forwarded samples with isGreen=false,
preventing windowed aggregation (enable_windows) from working when
dedup_interval is enabled. The green window state was never populated,
so late samples could be attributed to the wrong interval.

Pass ctx.isGreen instead of hardcoded false to the aggrPushFunc callback.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

lib/streamaggr/dedup.go

@@ -258,11 +258,11 @@ func (das *dedupAggrShard) flush(ctx *dedupFlushCtx, f aggrPushFunc) {
 
 		// Limit the number of samples per each flush in order to limit memory usage.
 		if len(dstSamples) >= 10_000 {
-			f(dstSamples, ctx.deleteDeadline, false)
+			f(dstSamples, ctx.deleteDeadline, ctx.isGreen)
 			clear(dstSamples)
 			dstSamples = dstSamples[:0]
 		}
 	}
-	f(dstSamples, ctx.deleteDeadline, false)
+	f(dstSamples, ctx.deleteDeadline, ctx.isGreen)
 	ctx.samples = dstSamples
 }