MAINT-21: tests read and patch the Controller through tools/main_files.py

Prepares the split of app/main.py's Controller into files by job, with no app
change. tools/main_files.py gives a test the text and the AST of main.py plus
the files split from it, and `live`, which sets a global in every file whose
functions read it (and raises when none does). Tests that read main.py's
source, and tests and replay tools that patch a main global (datetime,
compute, resolve, _mono, WRITE_BUDGET_S, ...), go through it, so they pass on
this layout and on the split one. test_split_patches.py fails when a test or
tool patches an app.main attribute that main.py no longer reads, or that
another file also reads. tools/maint21_same_ast.py proves every function,
method and module-level assignment of main.py at the base is found unchanged
in its new file.

Co-Authored-By: Claude <noreply@anthropic.com>

goodwe_controller/test_tariff24.py

@@ -40,6 +40,7 @@ logging.disable(logging.WARNING)
 
 import opt11p3_replay as rp                                    # noqa: E402
 from named_absence import first, nth, present                  # noqa: E402
+import main_files  # noqa: E402
 import app.main as m                                           # noqa: E402
 from app import homeview, modetrade, packmode                  # noqa: E402
 from app import price as _price, static_tariff as _st          # noqa: E402
@@ -196,7 +197,7 @@ def drive(o, *, start=NIGHT, minutes=20, soc0=None, choice=CHOICE,
         for i in c.inverters:
             i.dev_min, i.dev_max = -5000.0, 5000.0
         c.auto = True
-        real_dt, real_hv = m.datetime, homeview.datetime
+        real_dt, real_hv = main_files.live.datetime, homeview.datetime
         clock = [start]
 
         class _DT(real_dt):
@@ -204,7 +205,7 @@ def drive(o, *, start=NIGHT, minutes=20, soc0=None, choice=CHOICE,
             def now(cls, tz=None):
                 return clock[0] if tz is None else clock[0].astimezone(tz)
 
-        m.datetime = homeview.datetime = _DT
+        main_files.live.datetime = homeview.datetime = _DT
         _real_load = _price.load_prices, _st.load_prices
         _price.load_prices = _st.load_prices = _no_fetch
         started = task_started(o)
@@ -246,7 +247,7 @@ def drive(o, *, start=NIGHT, minutes=20, soc0=None, choice=CHOICE,
                     await task
                 except asyncio.CancelledError:
                     pass
-            m.datetime, homeview.datetime = real_dt, real_hv
+            main_files.live.datetime, homeview.datetime = real_dt, real_hv
             _price.load_prices, _st.load_prices = _real_load
         return c, started