docs(contrib): scheduling templates for mempalace-pi-session

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.
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# contrib/ — automation recipes for `mempalace-session`
# contrib/ — automation recipes for `mempalace-session` and `mempalace-pi-session`
Manual invocation of `mempalace-session` is fine on a machine you actively drive. For long-running devboxes, a weekly automated mine keeps the palace fresh without thinking about it. This directory ships ready-to-use templates for two common scheduling mechanisms.
Manual invocation of the session-mining wrappers is fine on a machine you actively drive. For long-running devboxes, a weekly automated mine keeps the palace fresh without thinking about it. This directory ships ready-to-use templates for two common scheduling mechanisms, for each wrapper.
> **Before using either**: confirm the toolkit is installed and the wrapper works —
> `mempalace-session --dry-run` should list qualifying sessions. If that errors, fix the install before scheduling.
> `mempalace-session --dry-run` (and/or `mempalace-pi-session --dry-run`) should list qualifying sessions. If that errors, fix the install before scheduling.
Pick **one**. Running both would double-mine (harmless — dedup skips everything on the second run — but wastes wall time on the HNSW repair).
Pick **one scheduler** (systemd *or* launchd *or* cron). The opencode and pi jobs can be installed side by side and staggered — templates ship with Mon 03:00 for opencode, Tue 03:00 for pi to avoid racing the post-mine HNSW repair.
## Templates at a glance
| File | What it schedules | When |
|---|---|---|
| `systemd/mempalace-session.{service,timer}` | opencode → palace | Mon 03:00 |
| `systemd/mempalace-pi-session.{service,timer}` | pi → palace | Tue 03:00 |
| `systemd/mempalace-session-devbox.{service,timer}` | opencode (inside a devbox container) → palace | Mon 03:00 |
| `launchd/se.jordbo.mempalace-session.plist` | opencode → palace (macOS) | Mon 03:00 |
| `launchd/se.jordbo.mempalace-pi-session.plist` | pi → palace (macOS) | Tue 03:00 |
| `cron/mempalace-session.cron` | opencode → palace | Mon 03:00 |
| `cron/mempalace-pi-session.cron` | pi → palace | Tue 03:00 |
| `cron/mempalace-session-devbox.cron` | opencode (devbox) → palace | Mon 03:00 |
The pi variants are drop-in copies of the opencode variants with script name and schedule updated; the install recipes below apply equally — just swap `mempalace-session` for `mempalace-pi-session` and the schedule day.
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