feat(mma): Complete Visual DAG implementation, fix link creation/deletion, and sync docs

conductor/tracks/minimax_provider_20260306/plan.md

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+# Implementation Plan: MiniMax Provider Integration (minimax_provider_20260306)
+
+> **Reference:** [Spec](./spec.md)
+
+## Phase 1: Provider Registration
+Focus: Add minimax to PROVIDERS lists and credentials
+
+- [ ] Task 1.1: Add "minimax" to PROVIDERS list
+    - WHERE: src/gui_2.py line 28
+    - WHAT: Add "minimax" to PROVIDERS list
+    - HOW: Edit the list
+
+- [ ] Task 1.2: Add "minimax" to app_controller.py PROVIDERS
+    - WHERE: src/app_controller.py line 117
+    - WHAT: Add "minimax" to PROVIDERS list
+
+- [ ] Task 1.3: Add minimax credentials template
+    - WHERE: src/ai_client.py (credentials template section)
+    - WHAT: Add minimax API key section to credentials template
+    - HOW:
+      ```toml
+      [minimax]
+      api_key = "your-key"
+      ```
+
+## Phase 2: Client Implementation
+Focus: Implement MiniMax client and model listing
+
+- [ ] Task 2.1: Add client globals
+    - WHERE: src/ai_client.py (around line 73)
+    - WHAT: Add _minimax_client, _minimax_history, _minimax_history_lock
+
+- [ ] Task 2.2: Implement _list_minimax_models
+    - WHERE: src/ai_client.py
+    - WHAT: Return list of available models
+    - HOW:
+      ```python
+      def _list_minimax_models(api_key: str) -> list[str]:
+          return ["MiniMax-M2.5", "MiniMax-M2.5-highspeed", "MiniMax-M2.1", "MiniMax-M2.1-highspeed", "MiniMax-M2"]
+      ```
+
+- [ ] Task 2.3: Implement _classify_minimax_error
+    - WHERE: src/ai_client.py
+    - WHAT: Map MiniMax errors to ProviderError
+
+- [ ] Task 2.4: Implement _ensure_minimax_client
+    - WHERE: src/ai_client.py
+    - WHAT: Initialize OpenAI client with MiniMax base URL
+
+## Phase 3: Send Implementation
+Focus: Implement _send_minimax function
+
+- [ ] Task 3.1: Implement _send_minimax
+    - WHERE: src/ai_client.py (after _send_deepseek)
+    - WHAT: Send chat completion request to MiniMax API
+    - HOW:
+      - Use OpenAI SDK with base_url="https://api.minimax.chat/v1"
+      - Support streaming and non-streaming
+      - Handle tool calls
+      - Manage conversation history
+
+- [ ] Task 3.2: Add minimax to list_models routing
+    - WHERE: src/ai_client.py list_models function
+    - WHAT: Add elif provider == "minimax": return _list_minimax_models()
+
+## Phase 4: Integration
+Focus: Wire minimax into the send function
+
+- [ ] Task 4.1: Add minimax to set_provider
+    - WHERE: src/ai_client.py set_provider function
+    - WHAT: Validate minimax model
+
+- [ ] Task 4.2: Add minimax to send routing
+    - WHERE: src/ai_client.py send function (around line 1607)
+    - WHAT: Add elif for minimax to call _send_minimax
+
+- [ ] Task 4.3: Add minimax to reset_session
+    - WHERE: src/ai_client.py reset_session function
+    - WHAT: Clear minimax history
+
+- [ ] Task 4.4: Add minimax to history bleeding
+    - WHERE: src/ai_client.py _add_bleed_derived
+    - WHAT: Handle minimax history
+
+## Phase 5: Testing
+Focus: Verify integration works
+
+- [ ] Task 5.1: Write unit tests for minimax integration
+    - WHERE: tests/test_minimax_provider.py
+    - WHAT: Test model listing, error classification
+
+- [ ] Task 5.2: Manual verification
+    - WHAT: Test provider switching in GUI