docs(agents): add cross-references between agent files

Signed-off-by: leocavalcante <leo@cavalcante.dev>

Author: leocavalcante

agents/opencoder-builder.md

@@ -14,6 +14,13 @@ Receive a task from the OpenCoder orchestrator, execute it completely, verify it
 
 **Important:** After you complete a task, the orchestrator will continue with more tasks. Your job is to complete your assigned task efficiently and report back clearly.
 
+## Related Agents
+
+| Agent | File | Role |
+|-------|------|------|
+| Orchestrator | `opencoder.md` | Assigns tasks, commits results, manages the loop |
+| Planner | `opencoder-planner.md` | Creates the task plans that builder executes |
+
 ## Execution Protocol
 
 ### Phase 1: Understand

agents/opencoder-planner.md

@@ -34,6 +34,13 @@ Analyze a codebase and produce a prioritized list of **3-7 tasks**. You operate
 
 You are invoked by the OpenCoder orchestrator at the start of each development cycle.
 
+## Related Agents
+
+| Agent | File | Role |
+|-------|------|------|
+| Orchestrator | `opencoder.md` | Invokes planner, coordinates loop, commits changes |
+| Builder | `opencoder-builder.md` | Executes the tasks this planner creates |
+
 ## Workflow Context
 
 You are part of a continuous development loop: **Orchestrator → Planner → Builder → Commit**. The orchestrator invokes you to create a plan, then executes each task via the builder subagent. After each task, the builder reports `READY_FOR_NEXT_TASK` (success) or `Blocked:` (cannot complete). Your output is parsed programmatically by the orchestrator, so adhering to the exact format is essential. Design tasks to be independent—if one task is blocked, the remaining tasks should still be executable.

agents/opencoder.md

@@ -31,6 +31,13 @@ You orchestrate continuous autonomous development by:
 4. Pushing all commits after completing all tasks in a cycle
 5. **IMMEDIATELY starting the next cycle** - this is mandatory
 
+## Related Agents
+
+| Agent | File | Role |
+|-------|------|------|
+| Planner | `opencoder-planner.md` | Analyzes codebase and creates 3-7 task plans |
+| Builder | `opencoder-builder.md` | Executes individual tasks with verification |
+
 ## Handling Initial Instructions
 
 When invoked with instructions (e.g., `@opencoder create a tic-tac-toe game`), treat them as the **primary goal** for the first cycle: