Implement fleet topology epidemiology tracker and strain plague map.

Adds epidemiology package, auth epidemiology_fix push, strain-based 3D map, and Vitest coverage.

server/internal/ai/seer_memory_test.go

@@ -0,0 +1,32 @@
+package ai
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestExtractSeerNote(t *testing.T) {
+	resp := `{"commands":[{"type":"noop","args":{}}]}
+SEER_NOTE: dns_txt lane succeeded on 10.0.1.0/24 after wsl exhaustion.`
+	note, ok := ExtractSeerNote(resp)
+	if !ok || note == "" {
+		t.Fatalf("expected note, got ok=%v note=%q", ok, note)
+	}
+	if !strings.Contains(note, "dns_txt") {
+		t.Fatalf("unexpected note: %q", note)
+	}
+}
+
+func TestAugmentUserPromptWithNotes(t *testing.T) {
+	got := AugmentUserPromptWithNotes("Agent: id=abc", "- prior note")
+	if !strings.Contains(got, "Seer notes") || !strings.Contains(got, "Agent: id=abc") {
+		t.Fatalf("augmented prompt: %s", got)
+	}
+}
+
+func TestAugmentUserPromptEmptyNotes(t *testing.T) {
+	base := "Agent: id=abc"
+	if AugmentUserPromptWithNotes(base, "") != base {
+		t.Fatal("expected unchanged prompt")
+	}
+}