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/duckduckgo/cmd/duckduckgo/main.go

@@ -26,7 +26,7 @@ var Flags = DuckDuckGoFlags{
 	},
 }
 
-func (f DuckDuckGoFlags) ToConfig(cmd *cli.Command) duckduckgo.Config {
+func (f DuckDuckGoFlags) ToConfig(cmd *cli.Command) (duckduckgo.Config, error) {
 	var res = duckduckgo.DefaultConfig
 
 	if r := cmd.String("region"); r != "" {
@@ -42,11 +42,11 @@ func (f DuckDuckGoFlags) ToConfig(cmd *cli.Command) duckduckgo.Config {
 		case "off":
 			res.SafeSearch = duckduckgo.SafeSearchOff
 		default:
-			panic("invalid safe search value")
+			return res, fmt.Errorf("invalid safe search value: %s", s)
 		}
 	}
 
-	return res
+	return res, nil
 }
 
 func deferClose(cl io.Closer) {
@@ -66,8 +66,10 @@ func main() {
 		Usage: "Search DuckDuckGo",
 		Flags: flags,
 		Action: func(ctx context.Context, command *cli.Command) error {
-			c := Flags.ToConfig(command)
-			defer deferClose(nil)
+			c, err := Flags.ToConfig(command)
+			if err != nil {
+				return err
+			}
 
 			query := strings.TrimSpace(strings.Join(command.Args().Slice(), " "))
 
@@ -105,9 +107,8 @@ 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/duckduckgo/duckduckgo_test.go

@@ -0,0 +1,85 @@
+package duckduckgo
+
+import (
+	"testing"
+)
+
+func TestConfig_ToSearchURL_Default(t *testing.T) {
+	c := Config{SafeSearch: SafeSearchOff}
+	u := c.ToSearchURL("test query")
+
+	if u.Host != "duckduckgo.com" {
+		t.Errorf("Host = %q, want %q", u.Host, "duckduckgo.com")
+	}
+
+	if u.Query().Get("q") != "test query" {
+		t.Errorf("q = %q, want %q", u.Query().Get("q"), "test query")
+	}
+
+	if u.Query().Get("kp") != "-2" {
+		t.Errorf("kp = %q, want %q", u.Query().Get("kp"), "-2")
+	}
+}
+
+func TestConfig_ToSearchURL_SafeSearchOn(t *testing.T) {
+	c := Config{SafeSearch: SafeSearchOn}
+	u := c.ToSearchURL("test")
+
+	if u.Query().Get("kp") != "1" {
+		t.Errorf("kp = %q, want %q", u.Query().Get("kp"), "1")
+	}
+}
+
+func TestConfig_ToSearchURL_SafeSearchModerate(t *testing.T) {
+	c := Config{SafeSearch: SafeSearchModerate}
+	u := c.ToSearchURL("test")
+
+	if u.Query().Get("kp") != "-1" {
+		t.Errorf("kp = %q, want %q", u.Query().Get("kp"), "-1")
+	}
+}
+
+func TestConfig_ToSearchURL_SafeSearchOff(t *testing.T) {
+	c := Config{SafeSearch: SafeSearchOff}
+	u := c.ToSearchURL("test")
+
+	if u.Query().Get("kp") != "-2" {
+		t.Errorf("kp = %q, want %q", u.Query().Get("kp"), "-2")
+	}
+}
+
+func TestConfig_ToSearchURL_WithRegion(t *testing.T) {
+	c := Config{SafeSearch: SafeSearchOff, Region: "us-en"}
+	u := c.ToSearchURL("test")
+
+	if u.Query().Get("kl") != "us-en" {
+		t.Errorf("kl = %q, want %q", u.Query().Get("kl"), "us-en")
+	}
+}
+
+func TestConfig_ToSearchURL_WithQuery(t *testing.T) {
+	c := Config{SafeSearch: SafeSearchOff}
+	u := c.ToSearchURL("golang testing")
+
+	if u.Query().Get("q") != "golang testing" {
+		t.Errorf("q = %q, want %q", u.Query().Get("q"), "golang testing")
+	}
+}
+
+func TestConfig_Validate_DefaultsSafeSearch(t *testing.T) {
+	c := Config{SafeSearch: 0}
+	c = c.validate()
+
+	if c.SafeSearch != SafeSearchOff {
+		t.Errorf("validate() SafeSearch = %d, want %d (SafeSearchOff)", c.SafeSearch, SafeSearchOff)
+	}
+}
+
+func TestConfig_ToSearchURL_NoRegion(t *testing.T) {
+	c := Config{SafeSearch: SafeSearchOff}
+	u := c.ToSearchURL("test")
+
+	if u.Query().Get("kl") != "" {
+		t.Errorf("kl should be empty when no region, got %q", u.Query().Get("kl"))
+	}
+}