fix: bug fixes, test coverage, and CI workflow

- Fix Nodes.First() panic on empty slice (return nil)
- Fix ticker leak in archive.go (create once, defer Stop)
- Fix cookie path matching for empty and root paths
- Fix lost query params in google.go (u.Query().Set was discarded)
- Fix type assertion panic in useragents.go
- Fix dropped date parse error in powerball.go
- Remove unreachable dead code in megamillions.go and powerball.go
- Simplify document.go WaitForNetworkIdle, remove unused root field
- Remove debug fmt.Println calls across codebase
- Replace panic(err) with stderr+exit in all cmd/ programs
- Fix duckduckgo cmd: remove useless defer, return error on bad safesearch
- Fix archive cmd: ToConfig returns error instead of panicking
- Add 39+ unit tests across 6 new test files
- Add Gitea Actions CI workflow (build, test, vet in parallel)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sites/megamillions/cmd/megamillions.go

@@ -51,10 +51,8 @@ func main() {
 		},
 	}
 
-	err := cli.Run(context.Background(), os.Args)
-
-	if err != nil {
-		panic(err)
+	if err := cli.Run(context.Background(), os.Args); err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
 	}
-
 }

sites/megamillions/megamillions.go

@@ -64,7 +64,6 @@ func getDrawing(_ context.Context, doc extractor.Document) (*Drawing, error) {
 		return nil, fmt.Errorf("failed to parse date: %w", err)
 	}
 
-	fmt.Println("ticks", ticks)
 	drawing.Date = netTicksToTime(ticks)
 
 	err = doc.ForEach("ul.numbers li.ball", func(n extractor.Node) error {
@@ -199,23 +198,12 @@ func getNextDrawing(_ context.Context, doc extractor.Document) (*NextDrawing, er
 
 	numeric := numericOnly(txt)
 
-	set := false
 	if strings.Contains(txt, "Billion") {
-		amt := currency.USD.Amount(numeric * 1000000000)
-		nextDrawing.Jackpot = amt
-		set = true
+		nextDrawing.Jackpot = currency.USD.Amount(numeric * 1000000000)
 	} else if strings.Contains(txt, "Million") {
-		amt := currency.USD.Amount(numeric * 1000000)
-		nextDrawing.Jackpot = amt
-		set = true
+		nextDrawing.Jackpot = currency.USD.Amount(numeric * 1000000)
 	} else {
-		amt := currency.USD.Amount(numeric)
-		nextDrawing.Jackpot = amt
-		set = true
-	}
-
-	if !set {
-		return nil, fmt.Errorf("failed to convert jackpot to currency: %w", err)
+		nextDrawing.Jackpot = currency.USD.Amount(numeric)
 	}
 
 	return &nextDrawing, nil

sites/megamillions/megamillions_test.go

@@ -0,0 +1,43 @@
+package megamillions
+
+import (
+	"testing"
+	"time"
+)
+
+func TestNetTicksToTime_Consistency(t *testing.T) {
+	// netTicksToTime converts .NET ticks to Go time.
+	// Verify it produces consistent results for the same input.
+	ticks := int64(638396256000000000)
+	t1 := netTicksToTime(ticks)
+	t2 := netTicksToTime(ticks)
+
+	if !t1.Equal(t2) {
+		t.Errorf("netTicksToTime is not consistent: %v != %v", t1, t2)
+	}
+}
+
+func TestNetTicksToTime_Ordering(t *testing.T) {
+	// A larger ticks value should produce a later time.
+	earlier := netTicksToTime(638396256000000000)
+	later := netTicksToTime(638396256100000000) // 10 seconds later in ticks
+
+	if !later.After(earlier) {
+		t.Errorf("expected later ticks to produce later time: %v vs %v", earlier, later)
+	}
+}
+
+func TestNetTicksToTime_DifferenceIsCorrect(t *testing.T) {
+	// .NET ticks are 100-nanosecond intervals.
+	// 10,000,000 ticks = 1 second.
+	ticks1 := int64(638396256000000000)
+	ticks2 := ticks1 + 10000000 // 1 second later
+
+	t1 := netTicksToTime(ticks1)
+	t2 := netTicksToTime(ticks2)
+
+	diff := t2.Sub(t1)
+	if diff != time.Second {
+		t.Errorf("expected 1 second difference, got %v", diff)
+	}
+}