feat: always-on adversarial review + scope drift + plan mode design tools (v0.14.3.0) (#694)

* feat: always-on adversarial review + scope drift resolver + cross-model tension format

Rewrite generateAdversarialStep() to remove LOC-based tier skipping. Every review
now runs both Claude adversarial subagent and Codex adversarial challenge. OLD_CFG
only gates Codex passes, not Claude. Add generateScopeDrift() shared resolver.
Fix cross-model tension AskUserQuestion to include RECOMMENDATION + Completeness.

* feat: add scope drift to /ship, extract from /review template

/ship gets {{SCOPE_DRIFT}} at Step 3.48 + PR body slot. /review replaces
hardcoded scope drift with {{SCOPE_DRIFT}} + {{PLAN_COMPLETION_AUDIT_REVIEW}}.

* feat: plan mode safe operations — browse, design, codex allowed in plan mode

Add preamble section declaring $B, $D, codex, and ~/.gstack/ writes as
plan-mode-safe. Unblocks design skills during planning.

* test: update adversarial + add scope drift assertions

Rename adversarial tests to reflect always-on behavior. Remove tier
threshold assertions. Add scope drift content assertions for both
/review and /ship generated SKILL.md files.

* chore: bump version and changelog (v0.14.3.0)

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

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

ship/SKILL.md.tmpl

@@ -232,6 +232,8 @@ If multiple suites need to run, run them sequentially (each needs a test lane).
 
 {{LEARNINGS_SEARCH}}
 
+{{SCOPE_DRIFT}}
+
 ---
 
 ## Step 3.5: Pre-Landing Review
@@ -509,6 +511,10 @@ you missed it.>
 <If no Greptile comments found: "No Greptile comments.">
 <If no PR existed during Step 3.75: omit this section entirely>
 
+## Scope Drift
+<If scope drift ran: "Scope Check: CLEAN" or list of drift/creep findings>
+<If no scope drift: omit this section>
+
 ## Plan Completion
 <If plan file found: completion checklist summary from Step 3.45>
 <If no plan file: "No plan file detected.">