fix: add mandatory execution instructions to editorial-review-prose workflow

Review found missing MANDATORY step-order enforcement and critical marker
on Step 3, which were present in the original XML and the reference pattern
(editorial-review-structure). Adds both to match established conventions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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.
+**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.
 
 **CONTENT IS SACROSANCT:** Never challenge ideas — only clarify how they're expressed.
 
@@ -44,7 +44,7 @@
   - If `llm`: Prioritize unambiguous references, consistent terminology, explicit structure, no hedging
   - If `humans`: Prioritize clarity, flow, readability, natural progression
 
-### Step 3: Editorial Review
+### Step 3: Editorial Review (CRITICAL)
 
 - If style_guide provided: Consult style_guide now and note its key requirements — these override default principles for this review
 - Review all prose sections (skip code blocks, frontmatter, structural markup)