feat(pager): document the Signal pager and add the receive timer

The pager worked but was undocumented and drifting stale: signal-cli warned the account had gone 47 days without a receive, and no runbook existed to hand a future session or a non-Claude runtime.

I added the runbook under docs/design/ and a roam-sync-shaped receive timer that drains the queue every 15 minutes, keeping the account warm and surfacing reply messages. I also generalized agent-page: it now sends directly from any machine holding the pager account and relays to velox only when it doesn't. ratio is linked as a device of the account, so a page lands even when velox is down.

The receive script no-ops cleanly where the account isn't registered, since the units stow onto every machine via the shared common package.

2 files changed, 20 insertions, 0 deletions

diff --git a/scripts/systemd/signal-receive.service b/scripts/systemd/signal-receive.service
new file mode 100644
index 0000000..d63a5c8
--- /dev/null
+++ b/scripts/systemd/signal-receive.service
@@ -0,0 +1,10 @@
+# Signal pager receive — keep the pager account warm on every machine holding it.
+# Stowed via the dotfiles `common` package, so it lands on both daily drivers;
+# the script no-ops cleanly where the account isn't registered. Enable per machine:
+#   systemctl --user daemon-reload && systemctl --user enable --now signal-receive.timer
+[Unit]
+Description=Drain the Signal pager account inbound queue (keeps it warm)
+
+[Service]
+Type=oneshot
+ExecStart=%h/code/rulesets/scripts/signal-receive.sh
diff --git a/scripts/systemd/signal-receive.timer b/scripts/systemd/signal-receive.timer
new file mode 100644
index 0000000..3fdaee0
--- /dev/null
+++ b/scripts/systemd/signal-receive.timer
@@ -0,0 +1,10 @@
+[Unit]
+Description=Keep the Signal pager account warm every 15 minutes
+
+[Timer]
+OnBootSec=3min
+OnUnitActiveSec=15min
+RandomizedDelaySec=60
+
+[Install]
+WantedBy=timers.target