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.