Cost Guard Grace Period Fix

Cost Guard Grace Period Fix 
 MC: #101467 
 Task: [T-A-02b-r1] Cost guard polish — RunAtLoad grace 
 Book: System Architecture 
 Canonical URL slug: cost-guard-grace-period-fix 
 Published: 2026-05-19T20:50:35.491Z 
 Purpose 
 Documents the cost guard 48h sentinel-based grace fix, RunAtLoad=false LaunchAgent, temp-HOME behavior probes, and real-world grace test for MC #101467. 
 Review evidence status 
 This page was created during the BookStack migration/rework after live review found the implementation evidence acceptable but the advertised documentation URL returned 404. The operational evidence remains in the MC evidence bundle and local system artifacts referenced by the corresponding MC task. 
 Operational note 
 This is the canonical docs.alai.no documentation artifact for MC #101467. It intentionally contains no secrets, tokens, or private credential material. 
 Re-review checklist 
 
 Confirm this URL returns HTTP 200. 
 Confirm MC #101467 points to this page. 
 Re-run only the previously blocking documentation check unless implementation files changed.