Transcribe and clean up on this machine, without installing anything first

whisper-server is started on --inference-path /v1/audio/transcriptions,
which is exactly the path api.py already builds for the hosted providers,
and llama-server answers /chat/completions the way OpenRouter does. So the
local half is one more base URL rather than a second code path: worker.py,
filetranscribe.py and meeting.py are untouched, and dictation, subtitles
and meetings all work here on the first try.

Three findings worth naming, none of them in the new code:

whisper.cpp cuts segments on tokens, which in Turkish lands inside a word
about as often as between two. Pasted raw that gives "akraba değ\niller.";
in a subtitle it gives a cue reading "değ". Whisper marks the start of a
word with a leading space, so a piece that does not begin with one
continues the word above it.

A small model will repeat the transcript until the context is full, and
every one of those tokens is a second of somebody waiting: measured at 206
seconds, and 25 with a ceiling on the reply. Hosted models are left alone,
where the same runaway is rare and a ceiling would cut the minutes short.

A server outlives SIGTERM and SIGKILL holding its model in memory. Signals
are now turned into an event Qt delivers, since Qt blocks in C where a
Python handler never runs, and a pid file lets the next start sweep up
what a SIGKILL left behind.

The minutes keep their own provider rather than following cleanup's. The
two jobs are not the same size: a 4B model here will strip the filler words
out of a dictation and will not write up an hour long meeting.

The suite runs offline now: a test that reaches the network says so instead
of quietly going there.

tests/support.py

@@ -18,6 +18,7 @@ import sys
 import tempfile
 import unittest
 import urllib.error
+import urllib.request
 import wave
 from unittest import mock
 
@@ -40,6 +41,12 @@ linux_only = unittest.skipUnless(
 )
 
 
+def _no_network(*args, **kwargs):
+    raise AssertionError(
+        "a test reached the network; wrap the call in support.fake_urlopen"
+    )
+
+
 def _no_exec(*args, **kwargs):
     raise AssertionError(
         "a test reached os.execv, which would replace the test process with the "
@@ -78,6 +85,11 @@ class DikteTest(unittest.TestCase):
         # with it and hang, so it fails loudly here instead.
         self.patch_attr(os, "execv", _no_exec)
 
+        # Every way out of here goes through urllib, so closing it is enough to
+        # keep the suite offline. A test that means to answer a request patches
+        # this again through fake_urlopen.
+        self.patch_attr(urllib.request, "urlopen", _no_network)
+
     # ---- helpers ---------------------------------------------------------
 
     def path(self, *parts):