Unified logging: rsyslog as the system logger, the ForgeFIRM log tree

rsyslog replaces busybox syslogd/klogd (VIRTUAL-RUNTIME_base-utils-syslog,
trimmed PACKAGECONFIG) and becomes the only log writer: the appended
/etc/rsyslog.conf sets the inputs and the ff_line format and includes
the per-logger rules that `forgectrl --render-syslog` renders from the
machine settings at boot. forgefirm-logrotate becomes forgefirm-logging:
render before rsyslog starts (S19), sweep the pre-syslog log files into
/data/forgefirm/legacy-logs once, and rotate the tree at boot and hourly
by rename + HUP instead of copytruncate. Pins bumped to the pushed
forgectrl (syslog emitter, Logs tab, export), grblHAL-glowforge (syslog
emitter) and python3-gfhardware apps (syslog handlers, capture dir);
the CI harnesses set FFLOG_STDERR=1 so failure diagnostics keep the
controller's log lines. BRINGUP carries the bench validation checklist
(Next work item 14); this is an image change and rides the next flash.

meta-forgefirm/recipes-forgefirm/forgefirm-app/forgefirm-app.inc

@@ -11,7 +11,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=62f8bb455fcc4bf177ecab380f71cd5d"
 
 SRC_URI = "git://github.com/ScottW514/python3-gfhardware.git;protocol=https;branch=master"
 # Pinned; bump deliberately (AUTOREV is not reproducible).
-SRCREV = "c3d1790e6cd8f11eee7b386b5314d53454a1c2db"
+SRCREV = "a0a174d8e9a6b4b6e3abe63acc51018199df4202"
 
 # Bump PV with every SRCREV move: the hash-derived package version is not
 # monotonic on its own and buildhistory QA fails the build when it sorts