cloud.pause-resume reads the job's limits through; pin the pass-through

The pulse header's envelope now reaches the cooling engine: the cloud
client (python3-gfhardware c34faa1) derives the coolant window and the
fans' minimum speeds from the header and rides them on every report,
and the engine (forgectrl 57f6064) resolves each as the stricter of its
setting and the job's, never looser and never overruling an off gate.
cloud.pause-resume, which runs a real print, now also reads the client's
"job limits from the header:" line and the engine's "effective limits:"
line from the two logs; two host cases cover the failure paths. The
needle guard lists the engine's phrases as not the app's.

COOLING.md section 2 explains what a cloud job brings with it; BRINGUP
item 19 records the pass-through as landed. Pins: forgectrl 57f6064,
forgefirm-app c34faa1 (0.1.14+git); fetch-verified.

forgetest/tests/test_cloud_needles.py

@@ -35,9 +35,10 @@ SIBLINGS = {"python3-gfhardware": "python3-gfhardware", "python3-gfutilities": "
 BUILT_PHRASES = ("warm up: holding", "cool down: holding", "warm up: skipped", "cool down: skipped",
                  'finished with event ":cancelled"', 'finished with event ":completed"',
                  "motion [", "print [")
-# Phrases that are not the app's: forgetest's own log, or a line prefix
-# of the log format rather than a message.
-NOT_APP = ("PASS", "gfcloud", "[")
+# Phrases that are not the app's: forgetest's own log, a line prefix of
+# the log format rather than a message, or a line of forgectrl's log (the
+# engine's effective-limits line, judged from its own file).
+NOT_APP = ("PASS", "gfcloud", "[", "effective limits: coolant ceiling", "header")
 
 PLACEHOLDER = re.compile(r"%(?:\([^)]*\))?[-+ #0]*\d*(?:\.\d+)?[sdifrxXeEgGcu]|%%")