Add semantic configuration resume evidence

internal/manifest/semantic_fingerprint_test.go

@@ -0,0 +1,80 @@
+package manifest
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+const testSemanticDigest = "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"
+
+func TestSemanticConfigFingerprintRoundTripsAndLegacyRecordsRemainReadable(t *testing.T) {
+	ctx := context.Background()
+	store := &LocalStore{}
+	dir := t.TempDir()
+	fingerprint := &SemanticConfigFingerprint{Version: 3, Digest: testSemanticDigest}
+
+	session := New("session", time.Now().UTC())
+	session.MarkStageSucceeded("prepare", time.Now().UTC(), nil)
+	session.Stages["prepare"].SemanticConfig = fingerprint
+	sessionPath := filepath.Join(dir, "session.json")
+	if err := store.Save(ctx, sessionPath, session); err != nil {
+		t.Fatal(err)
+	}
+	loadedSession, err := store.Load(ctx, sessionPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if loadedSession.Stages["prepare"].SemanticConfig == nil || !loadedSession.Stages["prepare"].SemanticConfig.Equal(*fingerprint) {
+		t.Fatalf("session fingerprint = %#v", loadedSession.Stages["prepare"].SemanticConfig)
+	}
+
+	run := NewRun("session", "campaign", "run", false, []string{"prepare"}, time.Now().UTC())
+	run.MarkStageSucceeded("prepare", time.Now().UTC(), nil)
+	run.Stages["prepare"].SemanticConfig = fingerprint
+	runPath := filepath.Join(dir, "run.json")
+	if err := store.SaveRun(ctx, runPath, run); err != nil {
+		t.Fatal(err)
+	}
+	loadedRun, err := store.LoadRun(ctx, runPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if loadedRun.Stages["prepare"].SemanticConfig == nil || !loadedRun.Stages["prepare"].SemanticConfig.Equal(*fingerprint) {
+		t.Fatalf("run fingerprint = %#v", loadedRun.Stages["prepare"].SemanticConfig)
+	}
+
+	legacyPath := filepath.Join(dir, "legacy.json")
+	legacy := `{"session_id":"session","created_at":"2026-01-01T00:00:00Z","updated_at":"2026-01-01T00:00:00Z","stages":{"prepare":{"name":"prepare","status":"succeeded","created_at":"2026-01-01T00:00:00Z","updated_at":"2026-01-01T00:00:00Z"}}}`
+	if err := os.WriteFile(legacyPath, []byte(legacy), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	legacyManifest, err := store.Load(ctx, legacyPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if legacyManifest.Stages["prepare"].SemanticConfig != nil {
+		t.Fatalf("legacy fingerprint = %#v, want nil", legacyManifest.Stages["prepare"].SemanticConfig)
+	}
+}
+
+func TestSemanticConfigFingerprintValidation(t *testing.T) {
+	for _, test := range []struct {
+		name  string
+		value SemanticConfigFingerprint
+		want  string
+	}{
+		{name: "zero version", value: SemanticConfigFingerprint{Digest: testSemanticDigest}, want: "positive"},
+		{name: "uppercase digest", value: SemanticConfigFingerprint{Version: 1, Digest: strings.ToUpper(testSemanticDigest)}, want: "lowercase"},
+		{name: "short digest", value: SemanticConfigFingerprint{Version: 1, Digest: "abcd"}, want: "lowercase"},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			if err := test.value.Validate(); err == nil || !strings.Contains(err.Error(), test.want) {
+				t.Fatalf("Validate() error = %v, want %q", err, test.want)
+			}
+		})
+	}
+}