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_alerts_reference.py

@@ -8,6 +8,8 @@ import unittest
 from pathlib import Path
 
 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'))
 sys.path.insert(0, str(ROOT / 'tests'))
 import tile_icons  # noqa: E402
@@ -22,7 +24,7 @@ class ReferenceTests(unittest.TestCase):
     def test_fields_and_limits_match_both_board_profiles(self):
         reference = alert_reference()
         for board, name in PROFILES.items():
-            text = (ROOT / name).read_text()
+            text = profiles.text(name)
             block = text.split('    - action: show_alert\n', 1)[1].split('    - action: dismiss_alert\n', 1)[0]
             self.assertEqual(re.findall(r'^        (\w+): (\w+)$', block, re.M), [(f['name'], f['type']) for f in reference['fields']], name)
             for field, key in (('title', 'ALERT_TITLE_MAX'), ('subtitle', 'ALERT_SUBTITLE_MAX'), ('button_text', 'ALERT_BUTTON_MAX')):