feat(oam): port LibreNMS agent tooling from KNELServerBuild [#474]

Port the live LibreNMS monitoring patterns from the legacy
KNELServerBuild repo into oam/librenms-agent/, joining the existing
OAM tooling (oxidized, unpoller, smokeping, netdisco):

- agent/ — upstream check_mk agent + snmp-extend scripts (dmi, dpkg,
  mysql, ntp-client, ntp-server, os-updates, postfix, raspberry, smart,
  ss, ups-nut), copied verbatim (md5-verified), never to be edited here
- setup.sh — deploy module ported from ProjectCode/Modules/OAM/
  oam-librenms.sh; only the legacy framework bootstrap was replaced
  with plain bash (path constants + print_info -> echo)
- snmp-sudo.conf — Debian snmpd sudo rule the extends require
  (Debian-snmp NOPASSWD /bin/cat); carried as a file only, sudoers
  install is a policy decision per AGENTS.md

Lint gates: extend the existing upstream-skip mechanism for the
verbatim agent scripts (tests/shellcheck.sh + check-rules.sh prune,
same precedent as archive/provisioning/Agents/librenms), and fix the
stale skip path there (provisioning/ moved to archive/provisioning in
6244c1c; the bash extends have been failing the whole-repo shellcheck
gate since).

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

oam/librenms-agent/agent/raspberry.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+#######################################
+# please read DOCS to succesfully get #
+# raspberry sensors into your host    #
+#######################################
+picmd='/usr/bin/vcgencmd'
+pised='/bin/sed'
+getTemp='measure_temp'
+getVoltsCore='measure_volts core'
+getVoltsRamC='measure_volts sdram_c'
+getVoltsRamI='measure_volts sdram_i'
+getVoltsRamP='measure_volts sdram_p'
+getFreqArm='measure_clock arm'
+getFreqCore='measure_clock core'
+getStatusH264='codec_enabled H264'
+getStatusMPG2='codec_enabled MPG2'
+getStatusWVC1='codec_enabled WVC1'
+getStatusMPG4='codec_enabled MPG4'
+getStatusMJPG='codec_enabled MJPG'
+getStatusWMV9='codec_enabled WMV9'
+
+$picmd $getTemp | $pised 's|[^0-9.]||g'
+$picmd "$getVoltsCore" | $pised 's|[^0-9.]||g'
+$picmd "$getVoltsRamC" | $pised 's|[^0-9.]||g'
+$picmd "$getVoltsRamI" | $pised 's|[^0-9.]||g'
+$picmd "$getVoltsRamP" | $pised 's|[^0-9.]||g'
+$picmd "$getFreqArm"  | $pised 's/frequency([0-9]*)=//g'
+$picmd "$getFreqCore" | $pised 's/frequency([0-9]*)=//g'
+$picmd "$getStatusH264" | $pised 's/H264=//g'
+$picmd "$getStatusMPG2" | $pised 's/MPG2=//g'
+$picmd "$getStatusWVC1" | $pised 's/WVC1=//g'
+$picmd "$getStatusMPG4" | $pised 's/MPG4=//g'
+$picmd "$getStatusMJPG" | $pised 's/MJPG=//g'
+$picmd "$getStatusWMV9" | $pised 's/WMV9=//g'
+$picmd "$getStatusH264" | $pised 's/enabled/2/g'
+$picmd "$getStatusMPG2" | $pised 's/enabled/2/g'
+$picmd "$getStatusWVC1" | $pised 's/enabled/2/g'
+$picmd "$getStatusMPG4" | $pised 's/enabled/2/g'
+$picmd "$getStatusMJPG" | $pised 's/enabled/2/g'
+$picmd "$getStatusWMV9" | $pised 's/enabled/2/g'
+$picmd "$getStatusH264" | $pised 's/disabled/1/g'
+$picmd "$getStatusMPG2" | $pised 's/disabled/1/g'
+$picmd "$getStatusWVC1" | $pised 's/disabled/1/g'
+$picmd "$getStatusMPG4" | $pised 's/disabled/1/g'
+$picmd "$getStatusMJPG" | $pised 's/disabled/1/g'
+$picmd "$getStatusWMV9" | $pised 's/disabled/1/g'