rebrand: sweep remaining switchboard refs + rename cookies/storage keys

- CSS headers (4 files): Switchboard Core → Armature
- Editor .mjs headers (8 files): Chat Switchboard → Armature
- SQL migration comments + seed data (20 files): Switchboard Core → Armature
- Webhook header: X-Switchboard-Event → X-Armature-Event
- Cookie: sb_token → arm_token (3 Go files + auth.js)
- localStorage: sb_auth → arm_auth (auth.js + 2 test runners)
- localStorage: switchboard_theme → armature_theme (theme.js + base.html)
- Debug engine filter: chatSwitchboard/switchboard/sb_ → armatureChat/armature/arm_
- JS export: switchboardTheme → armatureTheme (theme.mjs + code-editor.mjs)

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

packages/editor/css/main.css

@@ -1,5 +1,5 @@
 /* ==========================================
-   Switchboard Core — Editor Surface (v0.25.0)
+   Armature — Editor Surface (v0.25.0)
    ==========================================
    Replaces editor-mode.css for the pane-based editor.
    Covers: topbar, bootstrap, and component-specific

packages/icd-test-runner/js/framework.js

@@ -270,7 +270,7 @@
 
   function getAuthTokenFromStorage() {
     var env = (T.base || '').replace(/^\//, '') || 'default';
-    var keys = ['sb_auth_' + env, 'sb_auth', 'sb_token'];
+    var keys = ['arm_auth_' + env, 'arm_auth', 'arm_token'];
     for (var i = 0; i < keys.length; i++) {
       try {
         var raw = localStorage.getItem(keys[i]);

packages/sdk-test-runner/js/framework.js

@@ -141,7 +141,7 @@
 
   function _readToken() {
     var env  = (T.base || '').replace(/^\//, '') || 'default';
-    var keys = ['sb_auth_' + env, 'sb_auth', 'sb_token'];
+    var keys = ['arm_auth_' + env, 'arm_auth', 'arm_token'];
     for (var i = 0; i < keys.length; i++) {
       try {
         var raw = localStorage.getItem(keys[i]);

packages/webhook-notifier/script.star

@@ -21,7 +21,7 @@ def on_fire(ctx):
 
     resp = http.post(url, body=payload, headers={
         "Content-Type": "application/json",
-        "X-Switchboard-Event": data.get("event_name", "workflow.notify"),
+        "X-Armature-Event": data.get("event_name", "workflow.notify"),
     })
 
     # Log the delivery