Carry the power draw to the bar over the bus, not through a file (hq ADR 0260)

Modules talk over the bus. The power module's bundle puts each fresh reading of its own
sampler in its state draw, keyed by the machine; the bar's block shows that state, which
the bar's bundle watches under the read the mesh grants it. A new catalogue check refuses
a module naming another module's path under /run or /var/lib.

modules/i3status-rust/module.json

@@ -12,7 +12,7 @@
       "name": "node-bar",
       "scope": "node",
       "renders": {
-        "block": "{{- /* A block other modules contribute, in i3status-rust's grammar (novox/hq ADR 0255). The controller\nrenders one piece at a time: its fields (bar, place, order, shows, options) and module. */ -}}\n{{- if eq .shows \"battery\" -}}\n[[block]]\nblock = \"battery\"\n{{with .options}}{{with .device}}device = {{quote .}}\n{{end}}{{end -}}\nformat = \"$icon $percentage{ $time|}\"\ncharging_format = \"$icon $percentage{ $time|}\"\nnot_charging_format = \"$icon $percentage\"\nfull_format = \"$icon $percentage\"\nempty_format = \"$icon $percentage\"\nmissing_format = \"\"\n{{- else if eq .shows \"command\" -}}\n[[block]]\nblock = \"custom\"\ncommand = {{quote .options.command}}\ninterval = {{.options.interval}}\n{{- end}}\n\n"
+        "block": "{{- /* A block other modules contribute, in i3status-rust's grammar (novox/hq ADR 0255). The controller\nrenders one piece at a time: its fields (bar, place, order, shows, options), module and machine. */ -}}\n{{- if eq .shows \"battery\" -}}\n[[block]]\nblock = \"battery\"\n{{with .options}}{{with .device}}device = {{quote .}}\n{{end}}{{end -}}\nformat = \"$icon $percentage{ $time|}\"\ncharging_format = \"$icon $percentage{ $time|}\"\nnot_charging_format = \"$icon $percentage\"\nfull_format = \"$icon $percentage\"\nempty_format = \"$icon $percentage\"\nmissing_format = \"\"\n{{- else if eq .shows \"command\" -}}\n[[block]]\nblock = \"custom\"\ncommand = {{quote .options.command}}\ninterval = {{.options.interval}}\n{{- else if eq .shows \"state\" -}}\n[[block]]\nblock = \"custom\"\ncommand = {{quote (printf \"~/.local/bin/i3status-value %s %s\" .options.state (or .options.key .machine))}}\ninterval = 5\nhide_when_empty = true\n{{- end}}\n\n"
       }
     }
   ],
@@ -88,6 +88,14 @@
       "owner": "${machine:account}",
       "mode": "0755",
       "content": "#!/usr/bin/env bash\n# i3bar-watchdog [session-pid] (module i3status-rust, novox/hq ADR 0208): respawns a bar that died.\n#\n# i3 starts one i3bar per `bar { }` block and never restarts one that exits, and a reload does not\n# either. Changing the monitor setup reliably kills the bar that owns the tray. This brings back the\n# one missing i3bar, without restarting i3, and logs the outputs at that moment: the evidence for the\n# cause, which is i3bar's.\n#\n# Started once per session from the session's start, with the session's own pid; it ends when that\n# process does. Adopted from the predecessor's i3-bar-watchdog user unit of 2026-10-04.\nset -uo pipefail\n\nsession_pid=\"${1:-}\"\ninterval=\"${I3_BAR_WATCHDOG_INTERVAL:-5}\"\n# Two misses in a row before acting: an i3 restart tears every bar down and starts them again.\nconfirm=\"${I3_BAR_WATCHDOG_CONFIRM:-2}\"\n# Never respawn the same bar more often than this, so a bar that dies at once is not a tight loop.\ncooldown=\"${I3_BAR_WATCHDOG_COOLDOWN:-30}\"\n\nlog() { printf 'i3bar-watchdog: %s\\n' \"$*\" >&2; }\n\nfor tool in i3-msg i3bar pgrep; do\n\tcommand -v \"$tool\" >/dev/null 2>&1 || {\n\t\tlog \"$tool is missing; not watching\"\n\t\texit 1\n\t}\ndone\n\ndeclare -A missed=() fixed=()\n\nbar_ids() { i3-msg -t get_bar_config 2>/dev/null | grep -oE '\"[^\"]+\"' | tr -d '\"'; }\noutputs() { xrandr --listmonitors 2>/dev/null | tail -n +2 | awk '{print $2\" \"$3}' | tr '\\n' ' '; }\nsession_alive() { [ -z \"$session_pid\" ] || kill -0 \"$session_pid\" 2>/dev/null; }\n\nwhile session_alive; do\n\tsleep \"$interval\"\n\tsocket=\"$(i3 --get-socketpath 2>/dev/null)\"\n\t[ -n \"$socket\" ] && [ -S \"$socket\" ] || continue\n\tids=\"$(bar_ids)\"\n\t[ -n \"$ids\" ] || continue\n\twhile read -r id; do\n\t\t[ -n \"$id\" ] || continue\n\t\tif pgrep -u \"$EUID\" -f -- \"i3bar --bar_id=$id\" >/dev/null 2>&1; then\n\t\t\tmissed[$id]=0\n\t\t\tcontinue\n\t\tfi\n\t\tmissed[$id]=$((${missed[$id]:-0} + 1))\n\t\t[ \"${missed[$id]}\" -ge \"$confirm\" ] || continue\n\t\tnow=\"$(date +%s)\"\n\t\tif [ $((now - ${fixed[$id]:-0})) -lt \"$cooldown\" ]; then\n\t\t\tcontinue\n\t\tfi\n\t\tlog \"$id is gone; respawning it. Outputs now: $(outputs)\"\n\t\tnohup i3bar --bar_id=\"$id\" --socket=\"$socket\" >/dev/null 2>&1 &\n\t\tdisown 2>/dev/null || true\n\t\tfixed[$id]=\"$now\"\n\t\tsleep 2\n\t\tif pgrep -u \"$EUID\" -f -- \"i3bar --bar_id=$id\" >/dev/null 2>&1; then\n\t\t\tmissed[$id]=0\n\t\telse\n\t\t\tlog \"$id exited within 2s of respawning; check its status_command\"\n\t\tfi\n\tdone <<<\"$ids\"\ndone\n"
+    },
+    {
+      "id": "value",
+      "type": "file",
+      "path": "${machine:account-home}/.local/bin/i3status-value",
+      "owner": "${machine:account}",
+      "mode": "0755",
+      "content": "#!/bin/sh\n# i3status-value <state> <key> (module i3status-rust, novox/hq ADR 0260): one value another module keeps\n# on the bus, for a block it contributed.\n#\n# This module's own tools bundle watches the state on the bus (the mesh grants it the read) and leaves\n# the value's text in this module's own directory; this prints it. A value not refreshed for thirty\n# seconds is one its module stopped giving, and prints nothing, so the block hides rather than show an\n# old number as if it were now.\ndir=\"${XDG_RUNTIME_DIR:-/run/user/$(id -u)}/i3status-rust/values\"\nf=\"$dir/$1@$2\"\nif [ -r \"$f\" ] && [ $(( $(date +%s) - $(stat -c %Y \"$f\") )) -le 30 ]; then\n\thead -n 1 \"$f\"\nfi\n"
     }
   ],
   "build": {