Expose every order component as its own entity and prepare for release

Each cost line is now an entity rather than an attribute: subtotal, box price,
add-ons, tax and delivery fee, plus a total and free-delivery-remaining for the
open order, a delivery-day sensor, and a binary sensor that turns off at the
cutoff. Entities share a base class and declare a scope, so a description
states only the field it reads.

Also parses the driver tip, Bounty savings and the free-delivery threshold. The
threshold is carried across orders because the progress bar only renders on
carts that have not met it.

Adds LICENSE, hacs.json, a CI workflow, a pre-publish audit script, and a test
that cross-checks every entity's translation_key against both translation
files. Manifest URLs now point at GitHub rather than a private forge.

custom_components/freshharvest/binary_sensor.py

@@ -0,0 +1,62 @@
+"""Binary sensors for Fresh Harvest."""
+
+from __future__ import annotations
+
+from homeassistant.components.binary_sensor import (
+    BinarySensorEntity,
+    BinarySensorEntityDescription,
+)
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+
+from . import FreshHarvestConfigEntry
+from .coordinator import FreshHarvestCoordinator
+from .entity import FreshHarvestEntity
+
+DESCRIPTION = BinarySensorEntityDescription(
+    key="order_open",
+    translation_key="order_open",
+    icon="mdi:cart-arrow-right",
+)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: FreshHarvestConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up the binary sensor platform."""
+    async_add_entities([FreshHarvestOrderOpen(entry.runtime_data, entry)])
+
+
+class FreshHarvestOrderOpen(FreshHarvestEntity, BinarySensorEntity):
+    """Whether any upcoming order can still be changed.
+
+    The single most useful thing to automate on: it goes off when the cutoff
+    passes, which is the last moment to add something to the box.
+    """
+
+    entity_description = DESCRIPTION
+
+    def __init__(
+        self, coordinator: FreshHarvestCoordinator, entry: FreshHarvestConfigEntry
+    ) -> None:
+        super().__init__(coordinator, entry, DESCRIPTION.key)
+
+    @property
+    def is_on(self) -> bool:
+        """Return true while an order is still customizable."""
+        return self.target("open_order") is not None
+
+    @property
+    def extra_state_attributes(self) -> dict[str, str | None] | None:
+        """Surface which order is open and until when."""
+        order = self.target("open_order")
+        if order is None:
+            return None
+        return {
+            "delivery_date": order.delivery_date.isoformat()
+            if order.delivery_date
+            else None,
+            "shop_window": order.shop_window,
+        }