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

client/src/components/run/ConsoleTabs.tsx

@@ -14,7 +14,7 @@
  * toasts. The `+` menu opens a new tab in the free slot the server picks
  * (`slot: "auto"`) — a plain shell (`POST /api/lanes/:id/start {shell: true}`)
  * or an installed, enabled AI tool started bare on its default model, no
- * prompt (a prompt, router or worktree is still the workspace home's prompt
+ * prompt (a prompt, proxy or worktree is still the workspace home's prompt
  * box) — plus a link to Settings → Agents. Ten sessions is the server's limit
  * (`MAX_PANE_SLOT`). The bar is the console's only header: Home (the
  * workspace's home) at its left end, `actions` (the single pane's split menus)
@@ -51,13 +51,7 @@ import { AiToolIcon } from "../AiToolIcon";
 import { freeSlot, startInFreeTab } from "../lanes/startSession";
 import { PANE_DRAG_TYPE, RunIcon, startPaneDrag, type GroupsUpdate } from "./PaneGrid";
 import { insertionIndex } from "../../lib/laneOrderStorage";
-import {
-  type PaneGroups,
-  detachSlot,
-  groupOf,
-  leaves,
-  reorderGroups,
-} from "../../lib/paneLayout";
+import { type PaneGroups, detachSlot, groupOf, leaves, reorderGroups } from "../../lib/paneLayout";
 import { ContextMenu, MenuItem, MenuSeparator, useContextMenu } from "../ContextMenu";
 
 type AiToolsState = ReturnType<typeof useAiTools>;