chore: establish local platform baseline

internal/memoryindex/processor_test.go

@@ -0,0 +1,39 @@
+package memoryindex
+
+import (
+	"math"
+	"strings"
+	"testing"
+
+	"data-terminal-cloud/internal/developmentembedding"
+)
+
+func TestDevelopmentEmbeddingIsDeterministicAndNormalized(t *testing.T) {
+	first := developmentembedding.Vector("长者谈到小时候在河边散步。")
+	second := developmentembedding.Vector("长者谈到小时候在河边散步。")
+	other := developmentembedding.Vector("完全不同的记忆内容。")
+	if len(first) != developmentembedding.Dimensions || len(second) != len(first) {
+		t.Fatalf("embedding dimensions = %d, want %d", len(first), developmentembedding.Dimensions)
+	}
+	var squared float64
+	var different bool
+	for index := range first {
+		if first[index] != second[index] {
+			t.Fatalf("embedding differs at %d", index)
+		}
+		if first[index] != other[index] {
+			different = true
+		}
+		squared += first[index] * first[index]
+	}
+	if !different {
+		t.Fatal("different content produced the same embedding")
+	}
+	if math.Abs(math.Sqrt(squared)-1) > 1e-9 {
+		t.Fatalf("embedding norm = %.12f, want 1", math.Sqrt(squared))
+	}
+	literal := developmentembedding.Literal(first)
+	if !strings.HasPrefix(literal, "[") || !strings.HasSuffix(literal, "]") || strings.Count(literal, ",") != developmentembedding.Dimensions-1 {
+		t.Fatal("vector literal has an invalid shape")
+	}
+}