Rewrite the backup alerts in plain language

The alerts were written for whoever was debugging them, not for whoever reads
them on a phone on a Sunday. They led with the mechanism and left the reader to
work out whether anything was actually broken.

Each one now opens by saying what is and is not affected — the checklists and
the website are almost always fine, and an off-site copy problem is not an
emergency — then what happened, then what to do. The scary-sounding ones say
plainly that previous backups are untouched, because that is the first thing
worth knowing and it was never stated.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

deploy/org.waterschurch.checklist-weekly-health.plist

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>Label</key>
+    <string>org.waterschurch.checklist-weekly-health</string>
+
+    <!-- The one piece of mail that arrives on a schedule. Monday morning, so a problem is
+         seen at the start of a week rather than discovered on a Sunday. -->
+    <key>ProgramArguments</key>
+    <array>
+        <string>/Users/Studio/checklist-app/scripts/weekly-health.sh</string>
+    </array>
+
+    <key>StartCalendarInterval</key>
+    <dict>
+        <key>Weekday</key><integer>1</integer>
+        <key>Hour</key><integer>8</integer>
+        <key>Minute</key><integer>30</integer>
+    </dict>
+
+    <key>RunAtLoad</key>
+    <false/>
+
+    <key>StandardOutPath</key>
+    <string>/Users/Studio/Library/Logs/checklist-weekly-health.out.log</string>
+    <key>StandardErrorPath</key>
+    <string>/Users/Studio/Library/Logs/checklist-weekly-health.err.log</string>
+
+    <!-- Same two traps as the backup agent: launchd's PATH is minimal and has no node, and
+         it cannot execute anything inside ~/Documents, which is why this lives in
+         ~/checklist-app. See deploy/README.md. -->
+    <key>EnvironmentVariables</key>
+    <dict>
+        <key>PATH</key>
+        <string>/usr/local/bin:/opt/homebrew/bin:/usr/bin:/bin:/usr/sbin:/sbin</string>
+    </dict>
+</dict>
+</plist>