test(sync): compare positron shadow parity

Positron is shadow-compared on this branch, so the migration needs source-level evidence that provider observation still matches the legacy parser path sync currently trusts.

Cover a workspace-backed JSONL source through ObserveProviderSource and compare session output, messages, and data-version planning against ParsePositronSession.

Validation: go test -tags "fts5" ./internal/parser ./internal/sync -run 'TestObserveProviderSourceMatchesPositronLegacyParser|Test(DiscoverPositronSessions|PositronProvider|SyncPathsPositron|SyncAllPositron|SyncAllSincePositron)' -count=1; go test -tags "fts5" ./internal/parser ./internal/sync -count=1; go fmt ./...; go vet ./...; ./custom-gcl run --config .golangci.nilaway.yml ./internal/parser/... ./internal/sync/...; git diff --check

Author: mariusvniekerk

internal/sync/provider_shadow_positron_test.go

@@ -0,0 +1,54 @@
+package sync
+
+import (
+	"context"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"go.kenn.io/agentsview/internal/parser"
+)
+
+func TestObserveProviderSourceMatchesPositronLegacyParser(t *testing.T) {
+	root := t.TempDir()
+	sessionID := "positron-shadow"
+	hashDir := filepath.Join(root, "workspaceStorage", "workspace-hash")
+	chatDir := filepath.Join(hashDir, "chatSessions")
+	sourcePath := filepath.Join(chatDir, sessionID+".jsonl")
+	writeProviderShadowSourceFile(
+		t,
+		filepath.Join(hashDir, "workspace.json"),
+		`{"folder":"file:///Users/alice/code/positron-app"}`,
+	)
+	writeProviderShadowSourceFile(t, sourcePath, vscodeCopilotShadowFixture(sessionID))
+
+	provider, ok := parser.NewProvider(parser.AgentPositron, parser.ProviderConfig{
+		Roots:   []string{root},
+		Machine: "devbox",
+	})
+	require.True(t, ok)
+	sources, err := provider.Discover(context.Background())
+	require.NoError(t, err)
+	require.Len(t, sources, 1)
+
+	legacySession, legacyMessages, err := parser.ParsePositronSession(
+		sourcePath, "positron-app", "devbox",
+	)
+	require.NoError(t, err)
+	require.NotNil(t, legacySession)
+
+	observation, err := ObserveProviderSource(context.Background(), provider, ProviderObserveRequest{
+		Source:  sources[0],
+		Machine: "devbox",
+	})
+	require.NoError(t, err)
+	require.Len(t, observation.Results, 1)
+	legacySession.File.Hash = observation.Fingerprint.Hash
+
+	assert.Equal(t, *legacySession, observation.Results[0].Session)
+	assert.Equal(t, legacyMessages, observation.Results[0].Messages)
+	assert.Equal(t, []string{legacySession.ID}, observation.Planned.DataVersionSessionIDs())
+	assert.Empty(t, observation.Planned.Diagnostics)
+}