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/routes/run.js

@@ -30,7 +30,7 @@ const tmux = require("../lib/tmux");
 const lanesLib = require("../lib/lanes");
 const { sameOriginGuard } = require("../lib/same-origin");
 const aiTools = require("../lib/ai-tools");
-const { resumeRouter } = require("../lib/router-apply");
+const { resumeProxy } = require("../lib/proxy-apply");
 
 const router = Router();
 
@@ -341,12 +341,13 @@ router.post("/", (req, res) => {
       laneId,
       cwd,
       tool: lane?.tool || "claude",
-      // The session's AI Router, by name (key and endpoint from the store); a
+      // The session's AI Proxy, by name (key and endpoint from the store); a
       // resume that names none goes back to the one its session last ran on.
-      router:
-        body.router !== undefined
-          ? body.router
-          : resumeRouter(typeof body.resumeSessionId === "string" ? body.resumeSessionId : null),
+      // `router` is the pre-rename field, still taken from an older client.
+      proxy:
+        (body.proxy ?? body.router) !== undefined
+          ? (body.proxy ?? body.router)
+          : resumeProxy(typeof body.resumeSessionId === "string" ? body.resumeSessionId : null),
       model: typeof body.model === "string" && body.model ? body.model : null,
       permissionMode:
         typeof body.permissionMode === "string" && ALLOWED_PERMISSION_MODES.has(body.permissionMode)