feat: M15a — certificate revocation API, CRL endpoint, and revocation notifications

Implements core revocation infrastructure: POST /api/v1/certificates/{id}/revoke
with all 8 RFC 5280 reason codes, JSON-formatted CRL at GET /api/v1/crl, webhook
and email revocation notifications, best-effort issuer notification, and immutable
revocation audit trail. Includes 48 new tests across service, handler, integration,
and domain layers (600+ total). Fixes 3 pre-existing test bugs (team_test error
matching, agent_group delete status code, team handler per_page validation).

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

internal/integration/negative_test.go

@@ -8,6 +8,7 @@ import (
 	"log/slog"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 	"time"
 
@@ -39,10 +40,17 @@ func setupTestServer(t *testing.T) (*httptest.Server, *mockCertificateRepository
 		"iss-local": service.NewIssuerConnectorAdapter(localCA),
 	}
 
+	revocationRepo := newMockRevocationRepository()
+
 	auditService := service.NewAuditService(auditRepo)
 	policyService := service.NewPolicyService(policyRepo, auditService)
 	certificateService := service.NewCertificateService(certRepo, policyService, auditService)
 	notificationService := service.NewNotificationService(notifRepo, make(map[string]service.Notifier))
+
+	// Wire revocation dependencies
+	certificateService.SetRevocationRepo(revocationRepo)
+	certificateService.SetNotificationService(notificationService)
+	certificateService.SetIssuerRegistry(issuerRegistry)
 	renewalService := service.NewRenewalService(certRepo, jobRepo, renewalPolicyRepo, nil, auditService, notificationService, issuerRegistry, "server")
 	deploymentService := service.NewDeploymentService(jobRepo, targetRepo, agentRepo, certRepo, auditService, notificationService)
 	jobService := service.NewJobService(jobRepo, renewalService, deploymentService, logger)
@@ -671,3 +679,114 @@ func TestM11bEndpoints(t *testing.T) {
 		})
 	})
 }
+
+// TestRevocationEndpoints exercises the revocation API endpoints through a full integration stack.
+func TestRevocationEndpoints(t *testing.T) {
+	server, certRepo, _, _ := setupTestServer(t)
+
+	// Create a test certificate with a version
+	now := time.Now()
+	cert := &domain.ManagedCertificate{
+		ID:              "mc-revoke-test",
+		Name:            "Revocation Test Cert",
+		CommonName:      "revoke-test.example.com",
+		SANs:            []string{},
+		Environment:     "test",
+		OwnerID:         "owner-test",
+		TeamID:          "team-test",
+		IssuerID:        "iss-local",
+		RenewalPolicyID: "policy-1",
+		Status:          domain.CertificateStatusActive,
+		ExpiresAt:       now.AddDate(0, 6, 0),
+		Tags:            map[string]string{},
+		CreatedAt:       now,
+		UpdatedAt:       now,
+	}
+	certRepo.certs["mc-revoke-test"] = cert
+	certRepo.versions["mc-revoke-test"] = []*domain.CertificateVersion{
+		{
+			ID:            "cv-revoke-test",
+			CertificateID: "mc-revoke-test",
+			SerialNumber:  "REVOKE-SERIAL-001",
+			NotBefore:     now,
+			NotAfter:      now.AddDate(1, 0, 0),
+			CreatedAt:     now,
+		},
+	}
+
+	t.Run("RevokeCertificate_Success", func(t *testing.T) {
+		body := bytes.NewBufferString(`{"reason":"keyCompromise"}`)
+		resp, err := http.Post(server.URL+"/api/v1/certificates/mc-revoke-test/revoke", "application/json", body)
+		if err != nil {
+			t.Fatalf("request failed: %v", err)
+		}
+		defer resp.Body.Close()
+
+		if resp.StatusCode != http.StatusOK {
+			bodyBytes, _ := io.ReadAll(resp.Body)
+			t.Fatalf("expected 200, got %d: %s", resp.StatusCode, string(bodyBytes))
+		}
+
+		var result map[string]string
+		json.NewDecoder(resp.Body).Decode(&result)
+		if result["status"] != "revoked" {
+			t.Errorf("expected status 'revoked', got %s", result["status"])
+		}
+
+		// Verify certificate status updated
+		if cert.Status != domain.CertificateStatusRevoked {
+			t.Errorf("expected Revoked status, got %s", cert.Status)
+		}
+	})
+
+	t.Run("RevokeCertificate_AlreadyRevoked", func(t *testing.T) {
+		body := bytes.NewBufferString(`{"reason":"superseded"}`)
+		resp, err := http.Post(server.URL+"/api/v1/certificates/mc-revoke-test/revoke", "application/json", body)
+		if err != nil {
+			t.Fatalf("request failed: %v", err)
+		}
+		defer resp.Body.Close()
+
+		if resp.StatusCode != http.StatusBadRequest {
+			t.Errorf("expected 400 for already revoked, got %d", resp.StatusCode)
+		}
+	})
+
+	t.Run("RevokeCertificate_NotFound", func(t *testing.T) {
+		resp, err := http.Post(server.URL+"/api/v1/certificates/mc-nonexistent/revoke", "application/json", strings.NewReader("{}"))
+		if err != nil {
+			t.Fatalf("request failed: %v", err)
+		}
+		defer resp.Body.Close()
+
+		if resp.StatusCode != http.StatusNotFound {
+			t.Errorf("expected 404, got %d", resp.StatusCode)
+		}
+	})
+
+	t.Run("GetCRL_Success", func(t *testing.T) {
+		resp, err := http.Get(server.URL + "/api/v1/crl")
+		if err != nil {
+			t.Fatalf("request failed: %v", err)
+		}
+		defer resp.Body.Close()
+
+		if resp.StatusCode != http.StatusOK {
+			bodyBytes, _ := io.ReadAll(resp.Body)
+			t.Fatalf("expected 200, got %d: %s", resp.StatusCode, string(bodyBytes))
+		}
+
+		var crl map[string]interface{}
+		json.NewDecoder(resp.Body).Decode(&crl)
+
+		if crl["version"] != float64(1) {
+			t.Errorf("expected CRL version 1, got %v", crl["version"])
+		}
+
+		// Should have at least 1 entry from the revocation above
+		total, _ := crl["total"].(float64)
+		if total < 1 {
+			t.Errorf("expected at least 1 CRL entry, got %v", total)
+		}
+	})
+}