HA-008 HA-009: add discovery and history pipeline

Closes #17

Closes #18

app/ha/reader.py

@@ -1,9 +1,12 @@
 from __future__ import annotations
 
 from collections.abc import Sequence
+from datetime import datetime
 from typing import Any
 
 from app.ha.client import HaClient
+from app.ha.discovery import DiscoveredEntity, discover_entities
+from app.ha.history import EntityHistorySeries, normalize_history_payload
 from app.ha.models import HaEntitySummary
 
 
@@ -33,6 +36,22 @@ class HaReader:
             )
         return summaries
 
+    def discover(
+        self,
+        domains: set[str] | None = None,
+        learnable: bool | None = None,
+    ) -> Sequence[DiscoveredEntity]:
+        return discover_entities(list(self.read_entities()), domains=domains, learnable=learnable)
+
+    def read_history(
+        self,
+        entity_ids: list[str],
+        start_time: datetime,
+        end_time: datetime,
+    ) -> Sequence[EntityHistorySeries]:
+        payload = self._client.get_history(entity_ids, start_time, end_time)
+        return normalize_history_payload(payload)
+
 
 def _optional_str(value: object) -> str | None:
     if value is None or value == "":