feat(skills): rename kvb-org-split to kvb-org-swarm, add kvb-org-unify

kvb-org-swarm keeps agent work in its own worktree until it meets 90/5; kvb-org-unify brings the swarm's branches back together. Every skill that named kvb-org-split now names kvb-org-swarm. Cost 111 % accepted by the operator on 2026-11-11.

🎯 Fix: 92 %
💥 Break: 3 %
💸 Cost: 111 %
⏱️ Time: 100 %
🛡️ Security: 100 %
🏆 Score: 80
🚦 Gate: ⚠️ cost 111 % > 100: ask the operator before the commit

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

skills/kvb-git-pr-label/SKILL.md

@@ -11,7 +11,7 @@ holds:
 - **`hotfix`**: the pull request targets the default branch and fixes a
   failure on it, a red default-branch run or an issue that reproduces there;
   name the run or issue.
-- **`90/5`**: the pull request meets the bar of the `kvb-org-split` skill (fix
+- **`90/5`**: the pull request meets the bar of the `kvb-org-swarm` skill (fix
   confidence ≥ 90 %, break risk ≤ 5 %, cost and time ≤ 100 %; over
   100 %, ask the operator first, naming the cause), from the
   `kvb-check-score` block in its body or freshly assessed, and only when