- lib/notify.sh: route notify_send to every platform in NOTIFY_PLATFORM
(notify.env, default telegram; comma-separated = send to all). New
platforms need only a bin/pos-communication-<p> sender implementing
'send <value> [--markdown]' (Matrix/Synapse ready)
- pos-communication-telegram: add --markdown as alias for --parse-mode
markdown to match the sender contract
- lib/common.sh: load_system_env() — shared ~/.config/linux_post_install/
system.env for pos-system-* tools (env exported > file > default)
- pos-system-health/backup: load system.env and show effective dynamic
values (NOTIFY_PLATFORM, HEALTH_BACKUP_MAX_AGE_DAYS, BACKUP_SERVICE_ROOTS)
in --help
- config/system.env + config/notify.env templates copied by postinstall
- systemd/pos-health.service: EnvironmentFile for both configs so the
daily digest honors them
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