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_camera.py

@@ -10,6 +10,8 @@ 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'))
 import camera_feed  # noqa: E402
 from core import (ALERT_FIELDS, BROADCAST_SHOW, CAMERA_MIN_FIRMWARE, alert_camera, alert_reference, entity_id,  # noqa: E402
@@ -20,7 +22,7 @@ HAS_AIOHTTP = importlib.util.find_spec('aiohttp') is not None
 if HAS_AIOHTTP:
     from server import HomeAssistant, Manager
 
-PROFILE = (ROOT / 'guition-4848s040.yaml').read_text()
+PROFILE = profiles.text('guition-4848s040.yaml')
 TILES = (ROOT / 'components/smart_display/runtime_tiles.h').read_text()
 
 
@@ -87,7 +89,7 @@ class Rules(unittest.TestCase):
         self.assertEqual(PROFILE.count('if (url != current) {'), 2)
         # A busy camera port leaves the rest of the app running.
         self.assertIn("except OSError as error:\n            # Everything else still works; only camera images stay away.", (ROOT / 'screen_manager/app/server.py').read_text())
-        cyd = (ROOT / 'home-like-2432s028.yaml').read_text()
+        cyd = profiles.text('home-like-2432s028.yaml')
         self.assertNotIn('online_image', cyd)
         self.assertNotIn('camera_full.load', cyd)
         # The add-on's port is published, and the Docker route passes it on with the host network.