feat v1.12.0: Quality Scale conformance (phases 7-8)

- entry.runtime_data (HouseplanData in store.py) instead of hass.data; WS answers
  not_ready without a loaded entry
- test-before-setup (ConfigEntryNotReady), async_unload_entry, async_remove_entry
  (Lovelace resource cleanup), single_config_entry in manifest
- Store minor_version + migration hook; diagnostics.py (redacted); repairs
  (broken_plan issues, en/ru); system_health.py; strings.json
- quality_scale.yaml self-assessment; HA-harness tests (config flow, WS, upload)
  in CI on py3.13; CI backend job updated

custom_components/houseplan/store.py

@@ -0,0 +1,69 @@
+"""Storage helpers: versioned stores and per-entry runtime data."""
+from __future__ import annotations
+
+import asyncio
+from dataclasses import dataclass, field
+from typing import Any
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.storage import Store
+
+from .const import DOMAIN, STORAGE_CONFIG_KEY, STORAGE_KEY, STORAGE_MINOR_VERSION, STORAGE_VERSION
+
+
+class HouseplanStore(Store):
+    """Store with a migration hook.
+
+    Bump STORAGE_MINOR_VERSION for backward-compatible schema additions and
+    STORAGE_VERSION for breaking changes, then handle them here. Keeping the
+    skeleton in place from day one means old installations always pass through
+    a single, tested upgrade path.
+    """
+
+    async def _async_migrate_func(
+        self,
+        old_major_version: int,
+        old_minor_version: int,
+        old_data: dict[str, Any],
+    ) -> dict[str, Any]:
+        data = old_data
+        # if old_major_version == 1 and old_minor_version < 2:
+        #     ...migrate...
+        return data
+
+
+@dataclass
+class HouseplanData:
+    """Runtime data of the single config entry (entry.runtime_data)."""
+
+    store: HouseplanStore
+    config_store: HouseplanStore
+    # One lock for every load→modify→save cycle of both stores: prevents
+    # lost updates from concurrent WS calls and makes the rev check atomic.
+    write_lock: asyncio.Lock = field(default_factory=asyncio.Lock)
+
+
+HouseplanConfigEntry = ConfigEntry[HouseplanData]
+
+
+def create_data(hass: HomeAssistant) -> HouseplanData:
+    """Create the stores for a config entry."""
+    return HouseplanData(
+        store=HouseplanStore(hass, STORAGE_VERSION, STORAGE_KEY, minor_version=STORAGE_MINOR_VERSION),
+        config_store=HouseplanStore(
+            hass, STORAGE_VERSION, STORAGE_CONFIG_KEY, minor_version=STORAGE_MINOR_VERSION
+        ),
+    )
+
+
+def get_data(hass: HomeAssistant) -> HouseplanData | None:
+    """Runtime data of the loaded entry, or None when not set up."""
+    entries = hass.config_entries.async_loaded_entries(DOMAIN)
+    return entries[0].runtime_data if entries else None
+
+
+def get_entry(hass: HomeAssistant) -> ConfigEntry | None:
+    """The loaded config entry, or None."""
+    entries = hass.config_entries.async_loaded_entries(DOMAIN)
+    return entries[0] if entries else None