test(06-05): close framework coverage gaps in bouncer, surf, wire, fetchguard

- Registry neither-interface, nil-registry, and authenticate default
- MemoryStore sweep actually drops expired entries
- RegisterHouseMiddlewareFactory duplicate-name failure
- pathScopedCORS unmatched path plus empty-raw-group introspection
- Time UnmarshalJSON +00:00/Z and PublicOnlyMode host/IP cases

surf/limiter_coverage_test.go

@@ -0,0 +1,90 @@
+package surf
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"net/netip"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"git.golem15.com/golem15/summercms/compass"
+)
+
+// Gap (b): MemoryStore's sweep goroutine (purge), not TooManyAttempts' lazy
+// expiry. Construct with a short sweep and assert the internal map drops
+// an expired entry without calling TooManyAttempts.
+
+func TestMemoryStoreSweepRemovesExpiredEntry(t *testing.T) {
+	s := NewMemoryStore(15 * time.Millisecond)
+	t.Cleanup(func() { close(s.stop) })
+
+	s.Hit("k", 25*time.Millisecond)
+	s.mu.Lock()
+	n := len(s.entries)
+	s.mu.Unlock()
+	if n != 1 {
+		t.Fatalf("after Hit, entries = %d", n)
+	}
+
+	deadline := time.Now().Add(200 * time.Millisecond)
+	for time.Now().Before(deadline) {
+		s.mu.Lock()
+		n = len(s.entries)
+		s.mu.Unlock()
+		if n == 0 {
+			return
+		}
+		time.Sleep(10 * time.Millisecond)
+	}
+	t.Fatalf("sweep did not drop expired entry, count=%d", n)
+}
+
+func TestMemoryStoreAvailableInExpiredAndMissing(t *testing.T) {
+	s := NewMemoryStore(0)
+	if d := s.AvailableIn("missing"); d != 0 {
+		t.Fatalf("missing AvailableIn = %s", d)
+	}
+	s.Hit("k", 20*time.Millisecond)
+	if d := s.AvailableIn("k"); d <= 0 {
+		t.Fatalf("live AvailableIn = %s", d)
+	}
+	time.Sleep(30 * time.Millisecond)
+	if d := s.AvailableIn("k"); d != 0 {
+		t.Fatalf("expired AvailableIn = %s", d)
+	}
+}
+
+func TestTrustedProxiesParsesConfig(t *testing.T) {
+	if TrustedProxies(nil) != nil {
+		t.Fatal("nil cfg must return nil")
+	}
+	dir := t.TempDir()
+	if err := os.WriteFile(filepath.Join(dir, "app.yaml"), []byte("name: t\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(dir, "http.yaml"), []byte("trusted_proxies:\n  - 10.0.0.0/8\n  - not-a-cidr\n  - 192.168.0.0/16\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	cfg, err := compass.Open(compass.Options{Dir: dir, Environ: []string{}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	got := TrustedProxies(cfg)
+	if len(got) != 2 || got[0].String() != "10.0.0.0/8" || got[1].String() != "192.168.0.0/16" {
+		t.Fatalf("TrustedProxies = %v", got)
+	}
+}
+
+func TestClientIPNilRequestAndEmptyXFF(t *testing.T) {
+	if got := ClientIP(nil, nil); got != "" {
+		t.Fatalf("nil request = %q", got)
+	}
+	trusted := []netip.Prefix{mustPrefix("10.0.0.0/8")}
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	req.RemoteAddr = "10.0.0.1:443"
+	if got := ClientIP(req, trusted); got != "10.0.0.1" {
+		t.Fatalf("trusted RemoteAddr, empty XFF = %q", got)
+	}
+}