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/lanes.js

@@ -28,7 +28,7 @@ const laneFeatures = require("../lib/lane-features");
 const proofLib = require("../lib/proof");
 const { broadcast } = require("../websocket");
 const runs = require("../lib/pty-run");
-const { resumeRouter } = require("../lib/router-apply");
+const { resumeProxy } = require("../lib/proxy-apply");
 const { sameOriginGuard } = require("./run");
 const { writeLaneFile } = require("../lib/lane-file-write");
 const { pickPath } = require("../lib/native-dialog");
@@ -927,7 +927,7 @@ router.get("/:id/git/file", async (req, res) => {
     );
     res.json({ available: true, ...file });
   } catch (err) {
-    // A secret file (the router's API key) is refused at every rev.
+    // A secret file (where a proxy's API key once lived) is refused at every rev.
     if (err.code === "ESECRET") {
       return res.status(403).json({ error: { code: err.code, message: err.message } });
     }
@@ -2002,12 +2002,13 @@ router.post("/:id/:action", sameOriginGuard, async (req, res) => {
             // A NEW session in a worktree of its own (`claude --worktree`).
             worktree: body.worktree === true && !body.resumeSessionId,
             tool: sessionTool || current.tool || "claude",
-            // The SESSION's AI Router, by name; a resume that names none goes
-            // back to the one its session last ran on.
-            router:
-              body.router !== undefined
-                ? body.router
-                : resumeRouter(body.resumeSessionId || (body.resume ? current.session_id : null)),
+            // The SESSION's AI Proxy, by name; a resume that names none goes
+            // back to the one its session last ran on. `router` is the
+            // pre-rename field, still taken from an older client.
+            proxy:
+              (body.proxy ?? body.router) !== undefined
+                ? (body.proxy ?? body.router)
+                : resumeProxy(body.resumeSessionId || (body.resume ? current.session_id : null)),
             model: body.model,
             permissionMode: body.permissionMode,
             effort: body.effort,
@@ -2020,7 +2021,7 @@ router.post("/:id/:action", sameOriginGuard, async (req, res) => {
           });
           startedRunId = handle.id;
           // An extra pane's session is not the lane's run: `run_id` stays the
-          // pane-0 session every other path (reset, router restart) names.
+          // pane-0 session every other path (reset, stop) names.
           if (!slot) lanesLib.updateLane(current.id, { run_id: handle.id, status: "running" });
           return {};
         });