fix(orchestrator): run the tree timer a minute after each run

Root cause: a pkgmgr branch tree run takes 72.6 s real (55.5 s user) on
this host, while TimeoutStartSec=55 killed every run; the timer fired
again each minute, so the service burned a core and branch-tree.json
never appeared.

- kvb-orchestrator-tree.timer: OnActiveSec=30s plus
  OnUnitInactiveSec=60s instead of OnCalendar=minutely, so runs never
  overlap and the next one starts 60 s after the last ended.
- kvb-orchestrator-tree.service: TimeoutStartSec=600 and CPUQuota=50%.
- orchestrator.sh restarts the timer on install so the new schedule
  takes effect; README and requirement 001 follow.

🎯 Fix: 92 %
💥 Break: 4 %
💸 Cost: 100 %
⏱️ Time: –
🛡️ Security: 100 %
🏆 Score: 88
🚦 Gate: ✅ 90/5, cost and time <= 100, security 100 %

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

scripts/orchestrator.sh

@@ -225,7 +225,8 @@ tree_timer() {
 	cp -f "${HUB}/systemd/${TREE_UNIT}.service" "${HUB}/systemd/${TREE_UNIT}.timer" "${HUB}/systemd/${CLEANUP_UNIT}.service" "${HUB}/systemd/${CLEANUP_UNIT}.path" "${UNITS}/"
 	systemctl --user daemon-reload
 	systemctl --user enable --now "${TREE_UNIT}.timer" "${CLEANUP_UNIT}.path"
-	log "skills: ${TREE_UNIT}.timer writes ${TREE_DIR}/branch-tree.json every 60 s while the Agent Orchestrator page polls"
+	systemctl --user restart "${TREE_UNIT}.timer"
+	log "skills: ${TREE_UNIT}.timer writes ${TREE_DIR}/branch-tree.json a minute after each run while the Agent Orchestrator page polls"
 	log "skills: ${CLEANUP_UNIT}.path deletes the merged branches the operator signs in the Artifacts Tree, locally only"
 }