feat(provider): add MiMo Free no-auth provider

Bootstrap → JWT → chat flow with auto-retry. Inject the MiMoCode
system marker required to pass the upstream 403 anti-abuse gate,
derive JWT expiry from the exp claim, and use a stable per-machine
fingerprint as the bootstrap client.

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/executors/index.js

@@ -16,6 +16,7 @@ import { PerplexityWebExecutor } from "./perplexity-web.js";
 import { OllamaLocalExecutor } from "./ollama-local.js";
 import { CommandCodeExecutor } from "./commandcode.js";
 import { XiaomiTokenplanExecutor } from "./xiaomi-tokenplan.js";
+import { MimoFreeExecutor } from "./mimo-free.js";
 import { DefaultExecutor } from "./default.js";
 
 const executors = {
@@ -39,6 +40,8 @@ const executors = {
   "ollama-local": new OllamaLocalExecutor(),
   commandcode: new CommandCodeExecutor(),
   "xiaomi-tokenplan": new XiaomiTokenplanExecutor(),
+  "mimo-free": new MimoFreeExecutor(),
+  mmf: new MimoFreeExecutor(), // Alias for mimo-free
 };
 
 const defaultCache = new Map();
@@ -73,3 +76,4 @@ export { PerplexityWebExecutor } from "./perplexity-web.js";
 export { OllamaLocalExecutor } from "./ollama-local.js";
 export { CommandCodeExecutor } from "./commandcode.js";
 export { XiaomiTokenplanExecutor } from "./xiaomi-tokenplan.js";
+export { MimoFreeExecutor } from "./mimo-free.js";