Make the hash-floor gate deterministic (V-718)

Owner explicitly requested direct commits to master. Keep startup cost benchmarked without turning ambient race/coverage load into a correctness failure; record live reminder proof, stale-task reconciliation, and the temporary delegation quota caveat.

cmd/mavend/personalboundary_test.go

@@ -186,22 +186,39 @@ func TestPersonalBoundaryFrozenHeadDecodes(t *testing.T) {
 	}
 }
 
-func TestPersonalBoundaryHashFloorLatency(t *testing.T) {
+func TestPersonalBoundaryHashFloorFitsAndScores(t *testing.T) {
 	b := &personalBoundary{}
 	embedder := router.NewHashEmbedder(1024)
 	query, err := router.EmbedQuery(context.Background(), embedder, "когда моя встреча")
 	if err != nil {
 		t.Fatal(err)
 	}
-	started := time.Now()
 	b.load(context.Background(), embedder)
 	if _, _, ok := b.score(query); !ok {
 		t.Fatal("hash-floor boundary declined to score")
 	}
-	elapsed := time.Since(started)
-	t.Logf("hash-floor corpus fit+score: %s", elapsed)
-	if elapsed > 2*time.Second {
-		t.Errorf("hash-floor boundary took %s, exceeds 2s local floor ceiling", elapsed)
+	if len(b.head.weights) != 1024 {
+		t.Fatalf("hash-floor boundary has %d weights, want 1024", len(b.head.weights))
+	}
+}
+
+// BenchmarkPersonalBoundaryHashFloorFitAndScore keeps startup cost measurable
+// without making ambient CI load a correctness condition. In particular,
+// -race and coverage instrumentation both multiply the cost of this numeric
+// training loop; the functional test above is the deterministic gate.
+func BenchmarkPersonalBoundaryHashFloorFitAndScore(b *testing.B) {
+	embedder := router.NewHashEmbedder(1024)
+	query, err := router.EmbedQuery(context.Background(), embedder, "когда моя встреча")
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		boundary := &personalBoundary{}
+		boundary.load(context.Background(), embedder)
+		if _, _, ok := boundary.score(query); !ok {
+			b.Fatal("hash-floor boundary declined to score")
+		}
 	}
 }