Fix TestAddCommentUpdatesTimestamp timing flake on Windows

The test was failing on Windows CI because of insufficient time resolution
between creating an issue and adding a comment. Both operations could
complete within the same time unit, causing identical timestamps.

Added a 2ms sleep between operations to ensure updated_at is strictly
after the original timestamp, even on systems with lower time resolution.

Fixes: bd-pi7u

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/storage/sqlite/events_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/steveyegge/beads/internal/types"
 )
@@ -253,6 +254,10 @@ func TestAddCommentUpdatesTimestamp(t *testing.T) {
 
 	originalUpdatedAt := issue.UpdatedAt
 
+	// Sleep briefly to ensure timestamp difference on systems with low time resolution (e.g., Windows)
+	// This prevents flaky test failures when both operations complete in the same millisecond
+	time.Sleep(2 * time.Millisecond)
+
 	// Add comment
 	err = store.AddComment(ctx, issue.ID, "alice", "Test comment")
 	if err != nil {