Build every screen from one shared core plus a small file per board, the same firmware as before (0.2.84)

The two board profiles (5,000 lines each, 87 % the same text) become packages/core.yaml and one file per
board under packages/boards/: the hardware, a table of 84 sizes and font sizes, 18 hooks with the lines of C++
only that board adds inside a shared lambda, and the board's own sections. packages/cyd.yaml and
packages/guition.yaml keep their names and places (a screen installed from ESP Screens builds as before);
home-like-2432s028.yaml and guition-4848s040.yaml become the same entries for a checkout.

The firmware stays 0.2.70: the C++ ESPHome generates for each board, through the checkout profile and
through the GitHub package route, was compared line by line with the old profiles' (docs/TEST_RESULTS_0284.md).
tools/check_packages.py replaces tools/generate_packages.py; tools/profiles.py gives the tests and tools the
three files as one; docs/PROFILES.md says how the files fit together and how a board is added.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tests/test_updates.py

@@ -11,6 +11,8 @@ import tempfile
 import unittest
 
 ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(ROOT / 'tools'))
+import profiles  # noqa: E402
 sys.path.insert(0, str(ROOT / 'screen_manager/app'))
 from core import FIRMWARE_VERSION, discover
 import firmware
@@ -24,7 +26,7 @@ HAS_AIOHTTP = importlib.util.find_spec('aiohttp') is not None
 class VersionSourceTests(unittest.TestCase):
     def test_app_target_matches_shipped_firmware(self):
         for name in ('packages/cyd.yaml', 'packages/guition.yaml', 'home-like-2432s028.yaml', 'guition-4848s040.yaml'):
-            text = (ROOT / name).read_text()
+            text = profiles.text(name)
             self.assertIn(f'SCREEN_FIRMWARE_VERSION: "{FIRMWARE_VERSION}"', text, name)
             self.assertIn('name: "Device name"', text, name)
             self.assertIn('platform: wifi_info', text, name)