feat(review): carve adversarial, plan-completion, and review-army into sections

The three resolver macros ship already carves as siblings now load on demand
for /review too: skeleton 100.2KB -> 55.0KB (-45%), union 93.4KB. Resolvers
stay the single source of truth (sections wrap the macros). Step 0/1, scope
drift, critical pass, confidence calibration, and fix-first stay always-loaded.
Fixtures and pins follow the moved content (codex-hardening wrapped-sites,
review-army E2E fixture builds skeleton+sections with an empty-fixture guard).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

review/SKILL.md.tmpl

@@ -34,6 +34,10 @@ You are running the `/review` workflow. Analyze the current branch's diff agains
 
 ---
 
+{{SECTION_INDEX:review}}
+
+---
+
 ## Step 1: Check branch
 
 1. Run `git branch --show-current` to get the current branch.
@@ -44,7 +48,7 @@ You are running the `/review` workflow. Analyze the current branch's diff agains
 
 {{SCOPE_DRIFT}}
 
-{{PLAN_COMPLETION_AUDIT_REVIEW}}
+{{SECTION:plan-completion}}
 
 ## Step 2: Read the checklist
 
@@ -142,7 +146,7 @@ Follow the output format specified in the checklist. Respect the suppressions
 
 ---
 
-{{REVIEW_ARMY}}
+{{SECTION:review-army}}
 
 ---
 
@@ -266,7 +270,7 @@ If no documentation files exist, skip this step silently.
 
 ---
 
-{{ADVERSARIAL_STEP}}
+{{SECTION:adversarial}}
 
 ## Step 5.8: Persist Eng Review result