Quest windows via quest_definition_windows (D-008)

Per IMPLEMENTATION-ORDER.md 1.4: a quest_definition_windows table
(definition_id, window, due_time) declares which day windows a
definition spans, one row per definition+window via the composite
primary key; window is CHECK-constrained to morning/afternoon/evening.

- const.py: WINDOW_MORNING/AFTERNOON/EVENING, QUEST_WINDOWS canonical
  order, WINDOW_CLOCK_RANGES with the documented boundaries and the
  boundary-to-later-window rule documented for Feature 07.
- schema.py: windows DDL joins SCHEMA_V1_STATEMENTS; due_time is
  caller-validated strict HH:MM (DAO layer), matching the date policy.
- migrations.py: migration 4 is a plain CREATE IF NOT EXISTS statement
  list (no rebuild needed for a new table).
- dao_rules.py: QuestDefinitionsDao gains upsert_window (idempotent
  per window, due_time refresh in place), list_windows (const order),
  remove_window; _validate_time/_validate_window helpers.
- tests: windows DDL shape/constraints (CHECK matrix, duplicate,
  unknown definition), DAO round-trips, const range shapes; leak
  guards extended to the new table.

tests/test_migrations.py

@@ -17,7 +17,10 @@ from custom_components.nestquest.migrations import (
     apply_migrations,
     read_schema_version,
 )
-from custom_components.nestquest.schema import SCHEMA_V1_STATEMENTS
+from custom_components.nestquest.schema import (
+    SCHEMA_V1_STATEMENTS,
+    SCHEMA_V1_QUEST_DEFINITION_WINDOWS_DDL,
+)
 
 
 def _run(coro):
@@ -64,6 +67,7 @@ def _counts(database) -> dict[str, int]:
         "schedule_rules",
         "quest_definitions",
         "quest_definition_assignees",
+        "quest_definition_windows",
         "presence_schedules",
         "presence_overrides",
         "quest_instances",
@@ -101,6 +105,7 @@ def test_fresh_file_migration_creates_all_v1_tables(tmp_path) -> None:
             "schedule_rules",
             "quest_definitions",
             "quest_definition_assignees",
+            "quest_definition_windows",
             "presence_schedules",
             "presence_overrides",
             "quest_instances",
@@ -138,18 +143,19 @@ def test_empty_version_table_reads_as_version_0(tmp_path) -> None:
 
 
 def test_migration_list_shape() -> None:
-    """Migration 1 is the v1 DDL; 2 and 3 are the callable steps.
+    """Migration 1 is the v1 DDL; 2 and 3 are callable steps.
 
     Nothing ever shipped, so migration 1 was rewritten pre-release
     (D-007) to create the quest_* tables directly; migration 2 exists
-    for dev databases stamped version 1 by the pre-rename runner, and
+    for dev databases stamped version 1 by the pre-rename runner,
     migration 3 brings pre-D-008 definitions to the multi-assignee
-    model.
+    model, and migration 4 adds the windows table.
     """
     assert MIGRATIONS[0] == SCHEMA_V1_STATEMENTS
     assert callable(MIGRATIONS[1])
     assert callable(MIGRATIONS[2])
-    assert len(MIGRATIONS) == 3
+    assert MIGRATIONS[3] == SCHEMA_V1_QUEST_DEFINITION_WINDOWS_DDL
+    assert len(MIGRATIONS) == 4
 
 
 # ---------------------------------------------------------------------------