feat: enhance AI communication with dynamic system prompts, robust retry, and TUI formatters

.opencode/walkthrough.md

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+# Walkthrough: Enhanced Agent Communication
+
+I have successfully integrated the enhanced system prompt, retry mechanism, and TUI formatters.
+
+## Changes Applied
+
+### 1. Robust API Calls (`qwen-oauth.mjs`)
+- **Retry Logic**: Integrated `fetchWithRetry` for Vision API calls.
+- **Dynamic System Prompt**: `sendMessage` now accepts a `systemPrompt` argument, allowing the TUI to inject context-aware instructions instead of relying on hardcoded overrides.
+
+### 2. TUI Logic (`bin/opencode-ink.mjs`)
+- **System Prompt Injection**: `handleSubmit` now generates a clean, role-specific system prompt using `lib/agent-prompt.mjs`.
+- **Stream Refactoring**: Unified the streaming callback logic for cleaner code.
+- **Retry Integration**: `callOpenCodeFree` now uses `fetchWithRetry` for better resilience.
+- **Visual Feedback**: File save operations now use `formatSuccess` and `formatFileOperation` for consistent, bordered output.
+
+## Verification Steps
+
+> [!IMPORTANT]
+> You **MUST** restart your TUI process (`node bin/opencode-ink.mjs`) for these changes to take effect.
+
+1.  **Restart the TUI**.
+2.  **Test System Prompt**:
+    - Send a simple greeting: "Hello".
+    - **Expected**: A concise, direct response (no "As an AI..." preamble).
+    - ask "Create a file named `demo.txt` with text 'Hello World'".
+    - **Expected**: The agent should generate the file using the correct code block format.
+3.  **Test Visual Feedback**:
+    - Observe the success message after file creation.
+    - **Expected**: A green bordered box saying "✅ Success" with the file details.
+4.  **Test Retry (Optional)**:
+    - If you can simulate a network glitch, the system should now log "Retrying...".
+
+## Rollback
+Backups were created before applying changes:
+- `qwen-oauth.mjs.bak`
+- `bin/opencode-ink.mjs.bak`