opencode: add OAC

opencode/context/development/ai/mastra-ai/lookup/mastra-config.md

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+<!-- Context: development/mastra-config | Priority: high | Version: 1.0 | Updated: 2026-02-15 -->
+
+# Lookup: Mastra Configuration
+
+**Purpose**: Quick reference for Mastra file locations and registration.
+
+**Last Updated**: 2026-01-09
+
+---
+
+## File Locations
+
+| Component | Directory | Registration File |
+|-----------|-----------|-------------------|
+| **Mastra Instance** | `src/mastra/` | `src/mastra/index.ts` |
+| **Agents** | `src/mastra/agents/` | `src/mastra/index.ts` |
+| **Tools** | `src/mastra/tools/` | `src/mastra/index.ts` |
+| **Workflows** | `src/mastra/workflows/` | `src/mastra/index.ts` |
+| **Scorers** | `src/mastra/scorers/` | `src/mastra/index.ts` |
+| **Services** | `src/services/` | `src/mastra/shared.ts` |
+
+## Database Tables
+
+| Table Name | Description |
+|------------|-------------|
+| `mastra_traces` | Workflow execution traces |
+| `mastra_ai_spans` | LLM call spans and token usage |
+| `mastra_scorers` | Evaluation results and scores |
+| `mastra_workflow_state` | Current state of running workflows |
+
+## Common Commands
+
+| Command | Description |
+|---------|-------------|
+| `npm run dev` | Start Mastra in development mode |
+| `npm run traces` | View recent execution traces |
+| `npm run test:workflow` | Run the test workflow script |
+
+**Related**:
+- concepts/core.md
+- concepts/workflows.md