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/cli/agent_retire_test.go

@@ -46,7 +46,7 @@ func TestClient_RetireAgent_Success(t *testing.T) {
 	}))
 	defer server.Close()
 
-	client := NewClient(server.URL, "", "table")
+	client, _ := NewClient(server.URL, "", "table", "", false)
 	// Positional arg: the agent ID. No --force, no --reason — the default
 	// soft-retire path. Compile-fail until client.RetireAgent exists.
 	if err := client.RetireAgent([]string{"ag-1"}); err != nil {
@@ -101,7 +101,7 @@ func TestClient_RetireAgent_Force_WithReason_Success(t *testing.T) {
 	}))
 	defer server.Close()
 
-	client := NewClient(server.URL, "", "table")
+	client, _ := NewClient(server.URL, "", "table", "", false)
 	if err := client.RetireAgent([]string{"ag-1", "--force", "--reason", "decommissioning rack 7"}); err != nil {
 		t.Fatalf("RetireAgent(force+reason) err=%v want nil", err)
 	}
@@ -126,7 +126,7 @@ func TestClient_RetireAgent_Force_RequiresReason(t *testing.T) {
 	}))
 	defer server.Close()
 
-	client := NewClient(server.URL, "", "table")
+	client, _ := NewClient(server.URL, "", "table", "", false)
 	err := client.RetireAgent([]string{"ag-1", "--force"})
 	if err == nil {
 		t.Fatalf("RetireAgent(force, no reason) err=nil want client-side error")
@@ -150,7 +150,7 @@ func TestClient_RetireAgent_MissingID(t *testing.T) {
 	}))
 	defer server.Close()
 
-	client := NewClient(server.URL, "", "table")
+	client, _ := NewClient(server.URL, "", "table", "", false)
 	err := client.RetireAgent([]string{})
 	if err == nil {
 		t.Fatalf("RetireAgent([]) err=nil want missing-id error")
@@ -198,7 +198,7 @@ func TestClient_ListRetiredAgents_Success(t *testing.T) {
 	}))
 	defer server.Close()
 
-	client := NewClient(server.URL, "", "table")
+	client, _ := NewClient(server.URL, "", "table", "", false)
 	if err := client.ListRetiredAgents([]string{}); err != nil {
 		t.Fatalf("ListRetiredAgents err=%v want nil", err)
 	}
@@ -220,7 +220,7 @@ func TestClient_ListRetiredAgents_ServerError(t *testing.T) {
 	}))
 	defer server.Close()
 
-	client := NewClient(server.URL, "", "table")
+	client, _ := NewClient(server.URL, "", "table", "", false)
 	err := client.ListRetiredAgents([]string{})
 	if err == nil {
 		t.Fatalf("ListRetiredAgents(500) err=nil want propagated error")