v2.0.47: HTTPS Everywhere — TLS-only control plane, agents/CLI/MCP

Breaking change release. Plaintext HTTP listener removed. The certctl
control plane now terminates TLS 1.3 on :8443 via
http.Server.ListenAndServeTLS. No CERTCTL_TLS_ENABLED=false escape
hatch. No dual-listener mode. One-step cutover per docs/upgrade-to-tls.md.

Server
- cmd/server/tls.go: certHolder with SIGHUP hot-reload + atomic cert
  swap, buildServerTLSConfig (TLS 1.3 min, GetCertificate callback),
  preflightServerTLS validation
- cmd/server/main.go: ListenAndServeTLS in place of ListenAndServe,
  watchSIGHUP wiring, cert/key path config threading
- tls_test.go: 418-line regression coverage of reload, preflight,
  callback behavior, SAN validation

Config
- CERTCTL_TLS_CERT_PATH / CERTCTL_TLS_KEY_PATH (required)
- Plaintext rejection: agents/CLI/MCP pre-flight-fail on http://
  URLs with a pointer to docs/upgrade-to-tls.md

Agents, CLI, MCP
- All three pre-flight-reject http:// URLs with fail-loud diagnostic
- CERTCTL_SERVER_CA_BUNDLE_PATH for private-CA trust
- CERTCTL_SERVER_TLS_INSECURE_SKIP_VERIFY for dev-only bypass
  (loud warning on startup)
- install-agent.sh emits both vars as commented template lines

docker-compose
- certctl-tls-init sidecar generates SAN-valid self-signed cert into
  deploy/test/certs/ on first boot
- All demo-stack curls pin against ca.crt with --cacert

Helm chart
- Three TLS provisioning modes, exactly one required:
  - server.tls.existingSecret (operator-supplied)
  - server.tls.certManager.enabled (cert-manager integration)
  - server.tls.selfSigned.enabled (eval only — not for production)
- server-certificate.yaml template for cert-manager mode
- helm install without a TLS source fails at template render with
  a pointer to docs/tls.md

CI
- .github/workflows/ci.yml Helm Chart Validation step renders the
  chart in both existingSecret and cert-manager modes, plus an
  inverse guard-regression test that asserts helm template MUST
  refuse to render when no TLS source is configured. Previously
  the single `helm template` invocation hit the certctl.tls.required
  fail-loud guard and exit-1'd CI. Four invocations now: lint
  (existingSecret), template (existingSecret), template
  (cert-manager), template (no args — must fail).

Integration tests
- deploy/test/integration_test.go stands up the Compose stack over
  HTTPS, extracts the CA bundle, and exercises every certctl API
  over https://localhost:8443
- All 34 integration subtests green (per Phase 8 local CI-parity)

Documentation
- New: docs/tls.md (provisioning patterns, rotation, SIGHUP reload)
- New: docs/upgrade-to-tls.md (one-step cutover, no-downgrade
  warnings, fleet-roll sequencing)
- CHANGELOG.md: v2.2.0 "HTTPS Everywhere — The Irony" entry
  (file heading unchanged; release tag is v2.0.47)
- All curls in docs/, examples/, deploy/helm/ guides use
  https://localhost:8443 --cacert

Verification
- grep -rn "ListenAndServe[^T]" cmd/ internal/ → 0 hits
- grep -rn "\"http://" cmd/ internal/ → 2 benign hits (Caddy admin
  API default, SSRF doc comment) — zero certctl endpoints
- Tasks #197–#206 (Phases 0–8) all closed in the tracker

Files: 65 changed, 3489 insertions, 372 deletions (pre-CI-fix).

internal/mcp/tools_test.go

@@ -88,7 +88,7 @@ func TestRegisterTools_ToolCount(t *testing.T) {
 	api := mockCertctlAPI(log)
 	defer api.Close()
 
-	client := NewClient(api.URL, "test-key")
+	client, _ := NewClient(api.URL, "test-key", "", false)
 	RegisterTools(server, client)
 
 	// The server should have tools registered — we can verify by listing them
@@ -166,7 +166,7 @@ func TestToolEndToEnd_ListCertificates(t *testing.T) {
 	api := mockCertctlAPI(log)
 	defer api.Close()
 
-	client := NewClient(api.URL, "test-key")
+	client, _ := NewClient(api.URL, "test-key", "", false)
 
 	// Manually call the handler logic that would be registered as a tool
 	q := paginationQuery(1, 50)
@@ -204,7 +204,7 @@ func TestToolEndToEnd_CreateCertificate(t *testing.T) {
 	api := mockCertctlAPI(log)
 	defer api.Close()
 
-	client := NewClient(api.URL, "test-key")
+	client, _ := NewClient(api.URL, "test-key", "", false)
 
 	input := CreateCertificateInput{
 		Name:       "API Production",
@@ -244,7 +244,7 @@ func TestToolEndToEnd_TriggerRenewal(t *testing.T) {
 	api := mockCertctlAPI(log)
 	defer api.Close()
 
-	client := NewClient(api.URL, "test-key")
+	client, _ := NewClient(api.URL, "test-key", "", false)
 	data, err := client.Post("/api/v1/certificates/mc-api-prod/renew", nil)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
@@ -272,7 +272,7 @@ func TestToolEndToEnd_DeleteTarget(t *testing.T) {
 	api := mockCertctlAPI(log)
 	defer api.Close()
 
-	client := NewClient(api.URL, "test-key")
+	client, _ := NewClient(api.URL, "test-key", "", false)
 	data, err := client.Delete("/api/v1/targets/t-platform")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
@@ -300,7 +300,7 @@ func TestToolEndToEnd_RevokeCertificate(t *testing.T) {
 	api := mockCertctlAPI(log)
 	defer api.Close()
 
-	client := NewClient(api.URL, "test-key")
+	client, _ := NewClient(api.URL, "test-key", "", false)
 	input := RevokeCertificateInput{
 		ID:     "mc-api-prod",
 		Reason: "keyCompromise",
@@ -327,7 +327,7 @@ func TestToolEndToEnd_AgentHeartbeat(t *testing.T) {
 	api := mockCertctlAPI(log)
 	defer api.Close()
 
-	client := NewClient(api.URL, "test-key")
+	client, _ := NewClient(api.URL, "test-key", "", false)
 	_, err := client.Post("/api/v1/agents/agent-001/heartbeat", map[string]string{
 		"os":           "linux",
 		"architecture": "amd64",
@@ -347,7 +347,7 @@ func TestToolEndToEnd_ListWithFilters(t *testing.T) {
 	api := mockCertctlAPI(log)
 	defer api.Close()
 
-	client := NewClient(api.URL, "test-key")
+	client, _ := NewClient(api.URL, "test-key", "", false)
 	q := paginationQuery(1, 25)
 	q.Set("status", "Pending")
 	q.Set("type", "Renewal")
@@ -377,7 +377,7 @@ func TestToolEndToEnd_GetRawBinary(t *testing.T) {
 	}))
 	defer server.Close()
 
-	client := NewClient(server.URL, "test-key")
+	client, _ := NewClient(server.URL, "test-key", "", false)
 	data, ct, err := client.GetRaw("/.well-known/pki/crl/iss-local")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
@@ -397,7 +397,7 @@ func TestToolEndToEnd_ErrorPropagation(t *testing.T) {
 	}))
 	defer server.Close()
 
-	client := NewClient(server.URL, "test-key")
+	client, _ := NewClient(server.URL, "test-key", "", false)
 	_, err := client.Get("/api/v1/certificates", nil)
 	if err == nil {
 		t.Fatal("expected error for 403 response")