feat(cli-tools): add Devin CLI provider with ACP stdio executor

Wire Devin CLI as a routed provider that spawns the local `devin acp`
binary. Add the DevinCliExecutor, register it in the executor map, expose
its status through the cli-tools batch endpoint and devin-settings route,
and document setup in cliTools constants.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/app/api/cli-tools/all-statuses/route.js

@@ -14,6 +14,7 @@ import { GET as kiloGet } from "../kilo-settings/route";
 import { GET as deepseekTuiGet } from "../deepseek-tui-settings/route";
 import { GET as jcodeGet } from "../jcode-settings/route";
 import { GET as grokBuildGet } from "../grok-build-settings/route";
+import { GET as devinGet } from "../devin-settings/route";
 
 const STATUS_GETTERS = {
   claude: claudeGet,
@@ -29,6 +30,7 @@ const STATUS_GETTERS = {
   "deepseek-tui": deepseekTuiGet,
   jcode: jcodeGet,
   "grok-build": grokBuildGet,
+  devin: devinGet,
 };
 
 // Batch endpoint: gather all CLI tool statuses in one round-trip