restart <gid>: re-queue from history — torrents via rebuilt magnet
(urn:btih: + &tr= trackers), HTTP via original URIs keeping dir/out;
--continue=true resumes partials, complete files verify instantly.
retry <gid|all>: waits out internet outages (NET_PROBE seam,
--interval/--max-wait), re-queues and re-verifies; aria2 error 3 = real
problem → diagnosed + marked permanent (url:/bt: ids in download.retry,
skipped by retry all, manual restart overrides); --once/--quiet for the
healer timer.
Healer: pos-aria2-retry.{service,timer} user units — arms on download
start (add/torrent/metalink/restart), disables when nothing left.
watch <gid> auto-restarts after an outage.
Fixes from stub-suite review: ensure_healer missing from submit paths;
RESTART_NAME lost across do_restart subshell (download_name helper);
restart exited 1 (tmux test as last statement).
Stub harness (/tmp/opencode/dl-test) 119/119 green; make gen && make check green.
Docs: POS.md rows, howto/network.md outage recipe, SYSTEMD.md user units.
Persistent aria2c as a systemd user service (pos-aria2.service, enable --now,
linger warning) on localhost:6800 with a generated RPC secret in
~/.config/linux_post_install/download.env (chmod 600, env override). 18
commands: start/stop/status, add/torrent/metalink (auto-start, --tmux live
view), list/info/files/peers, pause/resume/remove/purge/move, limit/set,
watch (2s live repoll). JSON built via jq -nc --arg, never string
interpolation. Deps: aria2 in preinstall PACKAGES, aria2c/jq/curl guards
before --help. Docs: POS.md + howto/network.md + indices + Common Tasks row.
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