feat(models): implement custom model support for ollama/openrouter

Adds the ability for users to specify custom model IDs for Ollama and OpenRouter providers, bypassing the internal supported model list.

    - Introduces --ollama and --openrouter flags for the 'task-master models --set-<role>' command.
    - Updates the interactive 'task-master models --setup' to include options for entering custom Ollama/OpenRouter IDs.
    - Implements live validation against the OpenRouter API when a custom OpenRouter ID is provided.
    - Refines the model setting logic to prioritize explicit provider flags/choices.
    - Adds warnings when custom models are set.
    - Updates the changeset file.

tasks/tasks.json

@@ -3288,7 +3288,7 @@
           "title": "Implement `openrouter.js` Provider Module",
           "description": "Create and implement the `openrouter.js` module within `src/ai-providers/`. This module should contain functions to interact with various models via OpenRouter using the **`@openrouter/ai-sdk-provider` library**, adhering to the standardized input/output format defined for `ai-services-unified.js`. Note the specific library used.",
           "details": "",
-          "status": "pending",
+          "status": "in-progress",
           "dependencies": [],
           "parentTaskId": 61
         },
@@ -3297,7 +3297,7 @@
           "title": "Implement `xai.js` Provider Module using Vercel AI SDK",
           "description": "Create and implement the `xai.js` module within `src/ai-providers/`. This module should contain functions to interact with xAI models (e.g., Grok) using the **Vercel AI SDK (`@ai-sdk/xai`)**, adhering to the standardized input/output format defined for `ai-services-unified.js`.",
           "details": "",
-          "status": "in-progress",
+          "status": "done",
           "dependencies": [],
           "parentTaskId": 61
         },
@@ -3909,6 +3909,17 @@
       "dependencies": [],
       "priority": "medium",
       "subtasks": []
+    },
+    {
+      "id": 73,
+      "title": "Implement Custom Model ID Support for Ollama/OpenRouter",
+      "description": "Allow users to specify custom model IDs for Ollama and OpenRouter providers via CLI flag and interactive setup, with appropriate validation and warnings.",
+      "details": "**CLI (`task-master models --set-<role> <id> --custom`):**\n- Modify `scripts/modules/task-manager/models.js`: `setModel` function.\n- Check internal `available_models.json` first.\n- If not found and `--custom` is provided:\n    - Fetch `https://openrouter.ai/api/v1/models`. (Need to add `https` import).\n    - If ID found in OpenRouter list: Set `provider: 'openrouter'`, `modelId: <id>`. Warn user about lack of official validation.\n    - If ID not found in OpenRouter: Assume Ollama. Set `provider: 'ollama'`, `modelId: <id>`. Warn user strongly (model must be pulled, compatibility not guaranteed).\n- If not found and `--custom` is *not* provided: Fail with error message guiding user to use `--custom`.\n\n**Interactive Setup (`task-master models --setup`):**\n- Modify `scripts/modules/commands.js`: `runInteractiveSetup` function.\n- Add options to `inquirer` choices for each role: `OpenRouter (Enter Custom ID)` and `Ollama (Enter Custom ID)`.\n- If `__CUSTOM_OPENROUTER__` selected:\n    - Prompt for custom ID.\n    - Fetch OpenRouter list and validate ID exists. Fail setup for that role if not found.\n    - Update config and show warning if found.\n- If `__CUSTOM_OLLAMA__` selected:\n    - Prompt for custom ID.\n    - Update config directly (no live validation).\n    - Show strong Ollama warning.",
+      "testStrategy": "**Unit Tests:**\n- Test `setModel` logic for internal models, custom OpenRouter (valid/invalid), custom Ollama, missing `--custom` flag.\n- Test `runInteractiveSetup` for new custom options flow, including OpenRouter validation success/failure.\n\n**Integration Tests:**\n- Test the `task-master models` command with `--custom` flag variations.\n- Test the `task-master models --setup` interactive flow for custom options.\n\n**Manual Testing:**\n- Run `task-master models --setup` and select custom options.\n- Run `task-master models --set-main <valid_openrouter_id> --custom`. Verify config and warning.\n- Run `task-master models --set-main <invalid_openrouter_id> --custom`. Verify error.\n- Run `task-master models --set-main <ollama_model_id> --custom`. Verify config and warning.\n- Run `task-master models --set-main <custom_id>` (without `--custom`). Verify error.\n- Check `getModelConfiguration` output reflects custom models correctly.",
+      "status": "in-progress",
+      "dependencies": [],
+      "priority": "medium",
+      "subtasks": []
     }
   ]
 }