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/tools/opt11_identity.py

@@ -26,6 +26,7 @@ from datetime import datetime, timedelta, timezone
 
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
+import main_files  # noqa: E402
 import app.main as m                                      # noqa: E402
 from app.main import Controller                           # noqa: E402
 
@@ -157,7 +158,7 @@ def run(n, *, extra=None, dur=2700.0, store=None, on_cycle=None, load=house,
         for i in c.inverters:
             i.dev_min, i.dev_max = -5000.0, 5000.0
         c.auto = True
-        real_dt = m.datetime
+        real_dt = main_files.live.datetime
         clock = [0.0]
 
         class _DT(real_dt):
@@ -165,7 +166,7 @@ def run(n, *, extra=None, dur=2700.0, store=None, on_cycle=None, load=house,
             def now(cls, tz=None):
                 return BASE + timedelta(seconds=clock[0])
 
-        m.datetime = _DT
+        main_files.live.datetime = _DT
         rows = []
         try:
             t = 0.0
@@ -186,7 +187,7 @@ def run(n, *, extra=None, dur=2700.0, store=None, on_cycle=None, load=house,
                     on_cycle(c, t)
                 t += TICK
         finally:
-            m.datetime = real_dt
+            main_files.live.datetime = real_dt
         return rows, c
     return asyncio.run(go())