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/index.js

@@ -82,7 +82,7 @@ const importRouter = require("./routes/import");
 const updatesRouter = require("./routes/updates");
 const ccConfigRouter = require("./routes/cc-config");
 const codexConfigRouter = require("./routes/codex-config");
-const aiRoutersRouter = require("./routes/ai-routers");
+const aiProxiesRouter = require("./routes/ai-proxies");
 const gitCredentialsRouter = require("./routes/git-credentials");
 const aiToolsRouter = require("./routes/ai-tools");
 const runRouter = require("./routes/run");
@@ -133,7 +133,8 @@ function createApp() {
   app.use("/api/updates", updatesRouter);
   app.use("/api/cc-config", ccConfigRouter);
   app.use("/api/codex-config", codexConfigRouter);
-  app.use("/api/ai-routers", aiRoutersRouter);
+  // `/api/ai-routers` is the pre-rename path, kept for a client older than it.
+  app.use(["/api/ai-proxies", "/api/ai-routers"], aiProxiesRouter);
   app.use("/api/git-credentials", gitCredentialsRouter);
   app.use("/api/ai-tools", aiToolsRouter);
   app.use("/api/run", runRouter);
@@ -680,12 +681,12 @@ function startBackgroundServices() {
   } catch (err) {
     console.warn("dashboard-runs reconciliation failed:", err.message);
   }
-  // A router is chosen per session now: take the old per-workspace one out of
+  // A proxy is chosen per session now: take the old per-workspace one out of
   // each workspace's settings.local.json (a no-op once done).
   try {
-    require("./lib/router-apply").clearLaneRouters();
+    require("./lib/proxy-apply").clearLaneProxies();
   } catch (err) {
-    console.warn("clearing workspace routers failed:", err.message);
+    console.warn("clearing workspace proxies failed:", err.message);
   }
 }