feat: v2.5.5 — AI Router renamed AI Proxy, reload onto new builds, update no longer spins

AI Proxy (was AI Router):
- server/lib/ai-proxies.js, proxy-apply.js, routes/ai-proxies.js mounted at
  /api/ai-proxies and the old /api/ai-routers; `router` still accepted on the
  start routes; profiles move to <CLAUDE_HOME>/agenthub-proxies/
- dashboard_runs.router renamed in place to proxy: an older build on the same
  DB fails on that column, so dev and prod sharing one DB update together
- a proxy's baseUrl stored as its root (a typed /v1 made /v1/v1/messages);
  Test probes Claude /v1/messages and Codex /v1/responses
- Settings → AI Proxy (/settings/ai-router redirects), ProxyPicker

Updates:
- every tab reloads onto the new UI build when its WebSocket reconnects to a
  server of another version (lib/newBuildReload.ts, once per version)
- Update now stops waiting on a plugin chain that failed or pulled nothing
  (the old server never goes down), and reloads as soon as a new version answers

Also:
- a pane whose command exits at once says so (EPANEEXITED) instead of
  "Command failed: tmux set-option … mouse on"
- the pane drag preview draws where the pane actually lands

server/lib/ai-tools.js

@@ -21,7 +21,7 @@ const CMD_RE = /^[A-Za-z0-9._+-]+$/;
 const ENV_RE = /^[A-Za-z_][A-Za-z0-9_]*$/;
 const LAUNCHERS = new Set(["claude", "codex"]);
 const PROMPT_MODES = new Set(["argv", "flag", "after-start"]);
-const ROUTER_CAPABLE = new Set(["claude", "codex"]);
+const PROXY_CAPABLE = new Set(["claude", "codex"]);
 const PKG_RE = /^(@[a-z0-9][a-z0-9._-]*\/)?[a-z0-9][a-z0-9._-]*$/;
 // Files shipped in a release (built-in, or synced from the newest release) are
 // trusted to name a launcher and an install/update; a custom file is not.
@@ -417,7 +417,7 @@ function view() {
         prompt: t.prompt ? { mode: t.prompt.mode } : null,
         resume: !!t.resume,
         bypass: !!(t.bypass || t.bypassEnv),
-        routerCapable: ROUTER_CAPABLE.has(t.id),
+        proxyCapable: PROXY_CAPABLE.has(t.id),
         // claude/codex take a model through their own argv builders.
         modelFlag: Boolean(t.model || t.launcher),
         defaultModel: state.models[t.id] || null,
@@ -458,7 +458,7 @@ module.exports = {
   which,
   spawnTarget,
   siteOf,
-  ROUTER_CAPABLE,
+  PROXY_CAPABLE,
   CONFIG_SECRET_RE,
   __setCatalogDirs,
 };