fix(10-02): load execute-plan.md context in execute-phase command

- Command now loads both workflows (execution + orchestration)
- Agents commit tasks normally (removed DON'T COMMIT instruction)
- Orchestrator only commits metadata after all agents complete
- No duplication - single source of truth for execution logic

commands/gsd/execute-phase.md

@@ -27,8 +27,10 @@ Use this command when:
 </objective>
 
 <execution_context>
+@~/.claude/get-shit-done/workflows/execute-plan.md
 @~/.claude/get-shit-done/workflows/execute-phase.md
 @~/.claude/get-shit-done/templates/summary.md
+@~/.claude/get-shit-done/references/checkpoints.md
 </execution_context>
 
 <context>