feat(providers): add Xiaomi MiMo (global + China token plan)

Providers 19-20 (22nd & 23rd registry variants), sourced from Pi
(earendil-works/pi). Pi's xiaomi.ts / xiaomi-token-plan-cn.ts use plain
openAICompletionsApi (no thinking dialect) → Kigi Passthrough. Global: MiMo
at api.xiaomimimo.com/v1, XIAOMI_API_KEY, models.dev xiaomi. China token plan:
token-plan-cn.xiaomimimo.com/v1, XIAOMI_TOKEN_PLAN_CN_API_KEY, models.dev
xiaomi-token-plan-cn. Both Bearer + OpenAI listing + ChatCompletions +
restrict_to_enriched; /models auth-gated → validator.

id-match proven vs Pi's static ids (mimo-v2.5-pro, mimo-v2-flash, ...). The
CN token plan lists 4 mimo TTS models (tool_call=false); restrict's tool_call
cut drops them, keeping only the 3 chat models — the e2e proves this
non-vacuously with the real mimo-v2-tts. Review found no defects.

Registry at 23; picker 24 rows (welcome picker verified rendering all rows at
a taller viewport).

crates/codegen/kigi-shell/src/agent/models_fetch.rs

@@ -2348,6 +2348,96 @@ mod tests {
         );
     }
 
+    /// Xiaomi-cycle e2e: OpenAI-compatible MiMo (per Pi, plain completions).
+    /// /models is auth-gated + minimal; enrichment supplies context; restrict's
+    /// tool_call cut drops the mimo TTS models (tool_call=false) the token plan
+    /// lists; bare id round-trips under the xiaomi key; Passthrough.
+    #[tokio::test(flavor = "multi_thread")]
+    #[serial_test::serial]
+    async fn xiaomi_enriches_restricts_and_maps_passthrough() {
+        let platform_server = wiremock::MockServer::start().await;
+        wiremock::Mock::given(wiremock::matchers::method("GET"))
+            .and(wiremock::matchers::path("/models"))
+            .respond_with(wiremock::ResponseTemplate::new(200).set_body_json(
+                serde_json::json!({ "data": [
+                    { "id": "mimo-v2.5-pro", "object": "model" },
+                    // a TTS model (tool_call=false in enrichment) → dropped.
+                    { "id": "mimo-v2-tts", "object": "model" }
+                ]}),
+            ))
+            .expect(1)
+            .mount(&platform_server)
+            .await;
+        let modelsdev_server = wiremock::MockServer::start().await;
+        wiremock::Mock::given(wiremock::matchers::method("GET"))
+            .and(wiremock::matchers::path("/api.json"))
+            .respond_with(wiremock::ResponseTemplate::new(200).set_body_json(
+                serde_json::json!({ "xiaomi": { "models": {
+                    "mimo-v2.5-pro": {
+                        "limit": {"context": 256000, "output": 32768},
+                        "tool_call": true
+                    },
+                    "mimo-v2-tts": { "limit": {"context": 8192}, "tool_call": false }
+                }}}),
+            ))
+            .expect(1)
+            .mount(&modelsdev_server)
+            .await;
+        let cache_dir = tempfile::tempdir().unwrap();
+        let _base = kigi_test_support::EnvGuard::set(
+            kigi_models::XIAOMI_BASE_URL_ENV,
+            platform_server.uri(),
+        );
+        let _mdev = kigi_test_support::EnvGuard::set(
+            crate::agent::enrichment_fetch::MODELS_DEV_URL_ENV,
+            format!("{}/api.json", modelsdev_server.uri()),
+        );
+        let _mdev_cache = kigi_test_support::EnvGuard::set(
+            crate::agent::enrichment_fetch::MODELS_DEV_CACHE_DIR_ENV,
+            cache_dir.path(),
+        );
+        let endpoints = crate::agent::config::EndpointsConfig::default();
+        let keys = crate::agent::models::PlatformApiKeys::test_single(
+            kigi_models::PlatformId::Xiaomi,
+            "xm-1",
+        );
+        let result = tokio::task::spawn_blocking(move || {
+            fetch_platform_models_blocking(&endpoints, None, &keys)
+        })
+        .await
+        .unwrap()
+        .expect("fetch must succeed");
+        assert_eq!(
+            result
+                .models
+                .iter()
+                .map(|m| m.id.as_deref().unwrap_or_default())
+                .collect::<Vec<_>>(),
+            vec!["xiaomi/mimo-v2.5-pro"],
+            "the TTS model (tool_call=false) is dropped by restrict_to_enriched"
+        );
+        let entry = &result.models[0];
+        assert_eq!(
+            entry.context_window.get(),
+            256_000,
+            "context comes from enrichment (the wire listing carries none)"
+        );
+        assert_eq!(entry.max_completion_tokens, Some(32_768));
+        assert_eq!(entry.model, "mimo-v2.5-pro");
+        let model_entry = crate::agent::config::ModelEntry::from_config_entry(entry);
+        let creds = crate::agent::config::ResolvedCredentials {
+            api_key: Some("xm-1".into()),
+            base_url: entry.base_url.clone(),
+            auth_type: kigi_chat_state::AuthType::ApiKey,
+            auth_scheme: Default::default(),
+        };
+        let cfg = crate::agent::config::sampling_config_for_model(&model_entry, creds, None);
+        assert_eq!(
+            cfg.chat_compat,
+            kigi_sampling_types::ChatCompat::Passthrough
+        );
+    }
+
     #[test]
     fn get_env_keys_parses_strings_and_rejects_non_strings() {
         use crate::agent::config::EnvKeys;