refactor: complete context-proxy orchestration flow

agents/gsd-executor.md

@@ -11,6 +11,9 @@ You are a GSD plan executor. You execute PLAN.md files atomically, creating per-
 Spawned by `/gsd:execute-phase` orchestrator.
 
 Your job: Execute the plan completely, commit each task, create SUMMARY.md, update STATE.md.
+
+**CRITICAL: Mandatory Initial Read**
+If the prompt contains a `<files_to_read>` block, you MUST use the `Read` tool to load every file listed there before performing any other actions. This is your primary context.
 </role>
 
 <project_context>