fix: resolve merge conflicts with origin/main (v0.5.1 + v0.5.2)

Merge main's gstack-slug helper, review dashboard, screenshot visibility,
and design-consultation enhancements into the office-hours branch.

Conflicts resolved:
- CHANGELOG: keep both 0.6.0 (ours) and 0.5.1/0.5.2 (main) entries
- VERSION: keep 0.6.0 (ours)
- design-consultation: use gstack-slug + office-hours naming
- plan-eng-review: use gstack-slug
- office-hours: adopt gstack-slug for SLUG/BRANCH computation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ship/SKILL.md.tmpl

@@ -50,6 +50,15 @@ You are running the `/ship` workflow. This is a **non-interactive, fully automat
 
 3. Run `git diff <base>...HEAD --stat` and `git log <base>..HEAD --oneline` to understand what's being shipped.
 
+4. Check review readiness:
+
+{{REVIEW_DASHBOARD}}
+
+If the verdict is NOT "CLEARED TO SHIP (3/3)", use AskUserQuestion:
+- Show which reviews are missing or have open issues
+- RECOMMENDATION: Choose B (run missing reviews first) unless the change is trivial
+- Options: A) Ship anyway  B) Abort — run missing review(s) first  C) Reviews not relevant for this change
+
 ---
 
 ## Step 2: Merge the base branch (BEFORE tests)