53d96adc65
Drop-in equivalents of the opencode templates for each scheduler
mechanism:
systemd/mempalace-pi-session.{service,timer}
launchd/se.jordbo.mempalace-pi-session.plist
cron/mempalace-pi-session.cron
Schedule is staggered from the opencode jobs (Mon 03:00 -> Tue 03:00)
so machines running both don't race each other on the post-mine HNSW
repair step. Service unit uses ConditionPathExists=%h/.pi/agent/sessions
to no-op silently on machines that haven't used pi, matching the
opencode template's guard on ~/.local/share/opencode/opencode.db.
contrib/README.md grows a 'Templates at a glance' table so the set is
discoverable without reading the whole doc.