rebrand: Switchboard Core → Armature

- Rename Go module switchboard-core → armature (155+ files)
- Rename Docker image → gobha/armature
- Rename K8s resources, secrets, deployments
- Rename Prometheus metrics switchboard_* → armature_*
- Rename env vars SWITCHBOARD_ADMIN_* → ARMATURE_ADMIN_*
- Rename DB names switchboard_core* → armature*
- Update all frontend branding, notification templates, docs
- Update CI scripts, e2e tests, Keycloak realm, nginx conf
- Rename scripts/switchboard-ca.sh → scripts/armature-ca.sh
- Rename k8s/switchboard.yaml → k8s/armature.yaml
- Rename chart alerting/dashboard files
- Fix: DockerHub push uses env: binding for secret injection
- Helm chart updated (name, labels, template functions, dashboard, alerting)
- Replace favicon/icon assets with Armature brand

No functional changes. Pure mechanical rename + CI fix.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ROADMAP.md

@@ -1,4 +1,4 @@
-# Switchboard Core — Roadmap
+# Armature — Roadmap
 
 ## Current: v0.6.7 — Native mTLS
 
@@ -135,7 +135,7 @@ End-to-end mutual TLS without a reverse proxy. Targets systemd+podman deployment
 | TLS server mode | ✅ | Go binary calls `ListenAndServeTLS` directly. `TLS_CERT`, `TLS_KEY`, `TLS_CA` path config. TLS 1.3 minimum, no fallback. `server/config/tls.go` loader + validation. |
 | `MTLSNativeProvider` | ✅ | Reads `r.TLS.PeerCertificates[0]` — no header trust. `Subject.CommonName` → username. `sha256(Raw)` → `external_id`. Auto-provisions `auth_source=mtls`. Renamed existing `mtls.go` → `mtls_proxy.go`. Shared helpers in `mtls_helpers.go`. |
 | Node-to-node mTLS | ✅ | `BuildPeerTLSConfig()` constructs outbound TLS config with node cert + CA pool. Forward-looking — cluster registry is DB-backed (PG LISTEN/NOTIFY), no HTTP peer calls yet. |
-| `switchboard-ca.sh` | ✅ | Shell wrapper around openssl. Three commands: `init` (CA keypair) · `issue-node --name <n> --san <addrs>` (365d) · `issue-user --cn <name>` (90d). All output PEM. |
+| `armature-ca.sh` | ✅ | Shell wrapper around openssl. Three commands: `init` (CA keypair) · `issue-node --name <n> --san <addrs>` (365d) · `issue-user --cn <name>` (90d). All output PEM. |
 | Unit tests | ✅ | Ephemeral CA via `crypto/x509`. Fabricated `PeerCertificates`. Valid cert → user provisioned · no TLS → `ErrNoCert` · empty certs → `ErrNoCert` · no CN → `ErrInvalidCreds`. |
 | Integration tests | ✅ | Real TLS listener on localhost. No cert / wrong CA / expired → TLS handshake rejected. Valid cert → 200. Peer certificate CN + email visibility verified. |