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/__tests__/pty-run.test.js

@@ -213,7 +213,7 @@ describe("pty-run", () => {
     });
     pty.spawnRun({ laneId: 12, cwd: "/tmp/repo", tool: "codex" });
     // Through argv, never as a shell assignment typed into the pane: this is
-    // also the path an AI Router's API key takes, and a typed line would be
+    // also the path an AI Proxy's API key takes, and a typed line would be
     // rendered to every attached browser and land in the shell history.
     const at = respawn.indexOf("-e");
     assert.ok(at > -1, "expected a tmux -e environment flag");
@@ -309,7 +309,7 @@ describe("pty-run", () => {
     }
   });
 
-  it("spawnRun starts a session on ITS router: Claude by --settings, Codex by -p", () => {
+  it("spawnRun starts a session on ITS proxy: Claude by --settings, Codex by -p", () => {
     let newSessionArgv = null;
     tmux.__setExecImpl((args) => {
       if (args[0] === "has-session") {
@@ -320,7 +320,7 @@ describe("pty-run", () => {
       if (args[0] === "new-session") newSessionArgv = args;
       return "";
     });
-    // The router store and the files a spawn writes live under these homes.
+    // The proxy store and the files a spawn writes live under these homes.
     const saved = ["CLAUDE_HOME", "CODEX_HOME", "DASHBOARD_DATA_DIR"].map((k) => [
       k,
       process.env[k],
@@ -329,30 +329,30 @@ describe("pty-run", () => {
     process.env.CODEX_HOME = path.join(TMP, "codex");
     process.env.DASHBOARD_DATA_DIR = path.join(TMP, "data");
     try {
-      const { name } = require("../lib/ai-routers").createRouter({
-        label: "Router",
+      const { name } = require("../lib/ai-proxies").createProxy({
+        label: "Proxy",
         baseUrl: "http://localhost:20128/v1",
         apiKey: "sk-secret-value",
         model: "M",
       });
-      pty.spawnRun({ laneId: 51, cwd: "/tmp/repo", router: name, initialPrompt: "hi" });
+      pty.spawnRun({ laneId: 51, cwd: "/tmp/repo", proxy: name, initialPrompt: "hi" });
       const flag = newSessionArgv.find((a) => a.startsWith("--settings="));
-      assert.equal(flag, `--settings=${path.join(TMP, "data", "router-settings", `${name}.json`)}`);
+      assert.equal(flag, `--settings=${path.join(TMP, "data", "proxy-settings", `${name}.json`)}`);
       assert.ok(!newSessionArgv.join(" ").includes("sk-secret-value"));
-      assert.equal(require("../lib/dashboard-runs").getRun("agenthub-lane-51").router, name);
+      assert.equal(require("../lib/dashboard-runs").getRun("agenthub-lane-51").proxy, name);
 
-      pty.spawnRun({ laneId: 52, cwd: "/tmp/repo", tool: "codex", router: name });
+      pty.spawnRun({ laneId: 52, cwd: "/tmp/repo", tool: "codex", proxy: name });
       const at = newSessionArgv.indexOf("-p");
       assert.deepEqual(newSessionArgv.slice(at, at + 2), ["-p", name]);
       // The key rides tmux's -e, never the command line.
-      assert.ok(newSessionArgv.includes("AGENTHUB_ROUTER_KEY=sk-secret-value"));
+      assert.ok(newSessionArgv.includes("AGENTHUB_PROXY_KEY=sk-secret-value"));
 
       pty.spawnRun({ laneId: 53, cwd: "/tmp/repo" });
       assert.ok(!newSessionArgv.some((a) => a.startsWith("--settings=")));
-      assert.equal(require("../lib/dashboard-runs").getRun("agenthub-lane-53").router, null);
+      assert.equal(require("../lib/dashboard-runs").getRun("agenthub-lane-53").proxy, null);
       assert.throws(
-        () => pty.spawnRun({ laneId: 54, cwd: "/tmp/repo", router: "nope" }),
-        (e) => e.code === "EBADROUTER"
+        () => pty.spawnRun({ laneId: 54, cwd: "/tmp/repo", proxy: "nope" }),
+        (e) => e.code === "EBADPROXY"
       );
     } finally {
       for (const [k, v] of saved) {