fix: add content-sacrosanct guardrail to editorial review tasks

Both editorial review tasks (prose and structure) were missing the key
constraint that reviewers should never challenge the ideas/knowledge
themselves—only how clearly they are communicated. This restores the
original design intent.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/core/tasks/editorial-review-prose.xml

@@ -21,6 +21,8 @@
     <i>Focus on communication issues that impede comprehension - not style preferences</i>
     <i>NEVER rewrite for preference - only fix genuine issues</i>
 
+    <i critical="true">CONTENT IS SACROSANCT: Never challenge ideas—only clarify how they're expressed.</i>
+
     <principles>
       <i>Minimal intervention: Apply the smallest fix that achieves clarity</i>
       <i>Preserve structure: Fix prose within existing structure, never restructure</i>

src/core/tasks/editorial-review-structure.xml

@@ -39,6 +39,7 @@
       <i>One source of truth: If information appears identically twice, consolidate</i>
       <i>Scope discipline: Content that belongs in a different document should be cut or linked</i>
       <i>Propose, don't execute: Output recommendations-user decides what to accept</i>
+      <i critical="true">CONTENT IS SACROSANCT: Never challenge ideas—only optimize how they're organized.</i>
     </principles>
     <human-reader-principles>
       <i>These elements serve human comprehension and engagement-preserve unless clearly wasteful:</i>