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_watchdog.py

@@ -1161,9 +1161,12 @@ check("...and it does not raise the same card on every cycle - a per-PROCESS "
 
 # SAFETY-34: a Core-ONLY restart. The add-on process lives on (measured on
 # TEST-23), HA's memory is wiped, so the SAME process must re-assert the card.
+import os  # noqa: E402
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "tools"))  # noqa: E402
+import main_files  # noqa: E402
 import app.main as _main_mod  # noqa: E402
-_real_mono, _clock = _main_mod._mono, [_main_mod._mono()]
-_main_mod._mono = lambda: _clock[0]
+_real_mono, _clock = main_files.live._mono, [main_files.live._mono()]
+main_files.live._mono = lambda: _clock[0]
 try:
     _h3 = _CircHass(a_w=0.0, b_w=0.0)
     _b.hass = _h3
@@ -1173,7 +1176,7 @@ try:
     asyncio.run(_b.check_circulating())
     _late = [c for c in _h3.calls if c[0] == "persistent_notification"]
 finally:
-    _main_mod._mono = _real_mono
+    main_files.live._mono = _real_mono
 check("SAFETY-34: inside REANNOUNCE_S the same process does not re-raise - no "
       "storm on the event bus", len(_early) == 0)
 check("SAFETY-34: a Core-only restart wipes the card and the add-on process "