forgetest tests: the confirmed trims of the tool's own unit tests

The cases that tested a mock, a timer, a wording or a table, or that
replayed a judgment a host test already holds, leave forgetest/tests.
What catches a false PASS, keeps the bench safe, or guards the gate
stays.

- test_baseline: the fake sysfs tree is a mixin with no test_ methods,
  so ExtensionFreeTests and BaselineModeTests no longer re-run
  BaselineTests' 25 cases (133 runs, now 45). CoolPublishTests, the
  lamp-fade cases and TransientNotLeftoverTests go; PositionDeadbandTests
  keeps a reading past the band and an unreadable reading, both never
  excused. Both latch-relock cases stay.
- test_fixture: MdnsTests, the three timing cases, the probe's log
  wording, and nine prompt-routing variants go. A live test never runs
  unattended, the arm-press opt-in, the short-press edge, the presence
  press handing over the arm press, and the arm notice dropping at the
  press stay (35 cases, now 21).
- test_cloud_suite: three false-PASS guards stay: the latch open at a
  dark print's button, a lid stop that is not edge-driven, the kernel
  refusing the resume. The guards for the latch unlocking in the hold
  and a paused print resuming left with their catalog tests in 6a434bb.
  The rest go, with the harness pieces and the hunt-lid fixture only
  they read (41 cases, now 3).
- test_cooling_suite: GateOffTests, CriticalTierTests, FanGateTests and
  FansQuietTests go with their harness; the flow verdict's log reads
  stay: only the text after the offset, never an older verdict before it
  (the flow-under-load false-PASS guard), a rotated log read whole.
- test_queue: RunClockTests and three ordering cases go, and refusals
  are judged by a reason given, not its words; both live
  acknowledgment cases stay.
- test_takeover_position: the six cases that judge the head and move
  nothing stay.
- test_camera_home_return: the five cases where the head must not move
  stay, and so do the three that check the hand-back jog's direction and
  distance (homed, unhomed with the counters not counted twice, after
  cloud mode): a wrong sign or a double count drives the head into the
  gantry stops (15 cases, now 8).
- test_server: the keep-alive and ETag cases, the takeover and scope
  half of the bench case, and the page's self-contained asserts
  (test_page.py's) go.
- test_operator: the wording cases, the fixture case (test_fixture.py's)
  and JournalTests go.
- test_mode: the supervisor timeout table goes.
- test_takeover_client: the listener, the offline service back, the
  online client without the hunt, and GRBL under no marker stay.
- test_responsiveness: PageTests and ImplementationCostTests go; the
  log cache keeps appends, a partial line, a replaced file and a fresh
  list, and the fingerprint cache a changed manifest and one with no
  content hash.
- test_bench_registry: GfbenchTests and two description and argument
  pins go.
- test_installer: the log-format and TLS-wording cases and
  InstallerShapeTests go; the die case checks the reason is in the log,
  not its format.
- test_image: KernelIdentTests and the registration pin go.

Each file's __main__ guard now ends the file, and the docstrings say what
each still proves.

Proof: each of the fifteen files passes under Linux as forgetest-ci
discovers it, and pyflakes reports nothing new in them.

Acceptance: none; test-only.

forgetest/tests/test_takeover_client.py

@@ -9,9 +9,9 @@ that client is comes only from gfcloud's one-start markers. Started bare it
 is the online client with the service's connect-time hunt, and the moves
 the service sends after the hunt outlast the run. The start is made under
 the no-hunt marker, and under the offline marker when the takeover found
-the offline service, which it then proves came back; a miss is a leftover
-that fails the run. Runs against the fake forgectrl, a fake /proc, and a
-fake init script that plays the client's start."""
+the offline service, which it then proves came back. Runs against the
+fake forgectrl, a fake /proc, and a fake init script that plays the
+client's start."""
 import os
 import shutil
 import tempfile
@@ -141,38 +141,6 @@ class TakeoverClientTests(unittest.TestCase):
         self.assertTrue(any("back as the offline service (pid %d)" % self.NEW_PID in l for l in run.lines),
                         run.lines)
 
-    def test_an_online_client_after_the_offline_service_fails_the_run(self):
-        # the client that came up is not listening: an online client, or
-        # a marker the start never saw
-        self._offline_client(self.OLD_PID)
-        real = self._initd
-
-        def lost_marker(service, action, timeout=60):
-            if action == "start" and os.path.exists(baseline.OFFLINE_MARKER):
-                os.remove(baseline.OFFLINE_MARKER)
-            return real(service, action, timeout)
-        hw.initd = lost_marker
-        cap, run = self.takeover()
-        self.assertEqual(cap["restart_clients"],
-                         [{"where": "takeover end", "expected": "the offline service",
-                           "found": "a client that is not the offline service (pid %d)" % self.NEW_PID}])
-        left = baseline.Baseline(run.log)
-        items = []
-        left._preserved(items, cap)
-        self.assertEqual([x.item for x in items], ["cloud client at the takeover end"])
-        self.assertTrue(items[0].action.startswith("not restored"), items[0].action)
-
-    def test_no_client_started_takes_the_markers_down(self):
-        # the gate closed, or standby: nothing read the markers, and a
-        # later start must not come up offline or without its hunt
-        self._offline_client(self.OLD_PID)
-        self.comes_up = "gated"
-        cap, run = self.takeover()
-        self.assertEqual(self.at_start, ["gfcloud-nohunt", "gfcloud-offline"])
-        self.assertEqual(self.markers_left(), [])
-        self.assertEqual(len(cap["restart_clients"]), 1)
-        self.assertIn("no cloud client running", cap["restart_clients"][0]["found"])
-
     def test_an_online_client_comes_back_without_the_hunt(self):
         cap, run = self.takeover()
         self.assertEqual(self.at_start, ["gfcloud-nohunt"])
@@ -180,14 +148,6 @@ class TakeoverClientTests(unittest.TestCase):
         self.assertNotIn("restart_clients", cap)
         self.assertEqual(self.markers_left(), [])
 
-    def test_a_stale_offline_socket_file_is_not_the_offline_service(self):
-        # a socket another process left at the path: the online client
-        # found stays online
-        self._socket(99, 7002, baseline.OFFLINE_SOCKET)
-        cap, run = self.takeover()
-        self.assertEqual(self.at_start, ["gfcloud-nohunt"])
-        self.assertNotIn("restart_clients", cap)
-
     def test_grbl_mode_starts_under_no_marker(self):
         self.fc.state["mode"] = {"mode": "grbl", "controller": "running", "pid": self.OLD_PID,
                                  "motion": "verified"}