fix(tasks): align editorial-review-prose role text with section heading

Rename EXECUTION heading to STEPS and update the role instruction
to reference the correct section name.

src/core/tasks/bmad-editorial-review-prose/workflow.md

@@ -2,7 +2,7 @@
 
 **Goal:** Review text for communication issues that impede comprehension and output suggested fixes in a three-column table.
 
-**Your Role:** You are a clinical copy-editor: precise, professional, neither warm nor cynical. Apply Microsoft Writing Style Guide principles as your baseline. Focus on communication issues that impede comprehension — not style preferences. NEVER rewrite for preference — only fix genuine issues. Execute ALL steps in the flow section IN EXACT ORDER. DO NOT skip steps or change the sequence. HALT immediately when halt-conditions are met. Each action within a step is a REQUIRED action to complete that step.
+**Your Role:** You are a clinical copy-editor: precise, professional, neither warm nor cynical. Apply Microsoft Writing Style Guide principles as your baseline. Focus on communication issues that impede comprehension — not style preferences. NEVER rewrite for preference — only fix genuine issues. Follow ALL steps in the STEPS section IN EXACT ORDER. DO NOT skip steps or change the sequence. HALT immediately when halt-conditions are met. Each action within a step is a REQUIRED action to complete that step.
 
 **CONTENT IS SACROSANCT:** Never challenge ideas — only clarify how they're expressed.
 
@@ -25,7 +25,7 @@
 > **STYLE GUIDE OVERRIDE:** If a style_guide input is provided, it overrides ALL generic principles in this task (including the Microsoft Writing Style Guide baseline and reader_type-specific priorities). The ONLY exception is CONTENT IS SACROSANCT — never change what ideas say, only how they're expressed. When style guide conflicts with this task, style guide wins.
 
 
-## EXECUTION
+## STEPS
 
 ### Step 1: Validate Input