feat(generator): эталонный мир зафиксирован равным стартовому

- Зачем:
  - у дней 8-13 описи не нашлось читателя: обещание эталона в 14 дней
    снято решением владельца 2026-08-30 (#192, этап 7 — #9).
- Что:
  - резолюция перенесена в обе спеки, докстринг описи и словарь CONTEXT.md;
  - добавлен тест: проигранный через CLI день совпадает с хешем описи;
  - сняты замеры: пересборка описи 20,5 с, снимок 460,7 МБ, make test
    176,5 с — записаны в карту проверок и таблицу бюджетов.
- Проверка:
  - cd generator && make lint && make typecheck && make test (437 passed);
  - git diff по data/world-inventory.json пуст.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

generator/tests/test_plan.py

@@ -14,8 +14,8 @@ import pytest
 from clickstream_generator import plan, reference, world
 from clickstream_generator.seeds import CANONICAL_SEED
 
-# Горизонт эталонного снимка — две недели (спека, раздел 5).
-SNAPSHOT_DAYS = 14
+# Окно замера плана — две недели: два цикла недельной сезонности.
+WINDOW_DAYS = 14
 
 
 @pytest.fixture(autouse=True)
@@ -54,9 +54,9 @@ def test_the_plan_is_a_pure_function_of_the_seed():
 
 
 def test_counters_are_a_pure_function_of_the_seed():
-    first = plan.counters(CANONICAL_SEED, SNAPSHOT_DAYS)
+    first = plan.counters(CANONICAL_SEED, WINDOW_DAYS)
     plan.cohort.cache_clear()
-    assert first == plan.counters(CANONICAL_SEED, SNAPSHOT_DAYS)
+    assert first == plan.counters(CANONICAL_SEED, WINDOW_DAYS)
 
 
 def test_a_remembered_cohort_cannot_be_spoiled_from_outside():
@@ -216,12 +216,12 @@ def test_the_passport_points_into_the_directories():
 
 def test_the_daily_audience_matches_the_spec_band():
     """6–8 тыс. посетителей в день — правдоподобный средний магазин."""
-    counters = plan.counters(CANONICAL_SEED, SNAPSHOT_DAYS)
+    counters = plan.counters(CANONICAL_SEED, WINDOW_DAYS)
     assert all(6_000 <= size <= 8_000 for size in counters.audience)
 
 
 def test_the_influx_holds_its_daily_number():
-    counters = plan.counters(CANONICAL_SEED, SNAPSHOT_DAYS)
+    counters = plan.counters(CANONICAL_SEED, WINDOW_DAYS)
     average = sum(counters.new_cookies) / len(counters.new_cookies)
     assert abs(average - world.DAILY_INFLUX) < world.DAILY_INFLUX // 10
 
@@ -232,7 +232,7 @@ def test_the_influx_breathes_with_the_week():
     def mean(numbers: tuple[int, ...] | list[int]) -> float:
         return sum(numbers) / len(numbers)
 
-    counters = plan.counters(CANONICAL_SEED, SNAPSHOT_DAYS)
+    counters = plan.counters(CANONICAL_SEED, WINDOW_DAYS)
     weekdays = [size for day, size in enumerate(counters.new_cookies) if day % 7 < 5]
     weekend = [size for day, size in enumerate(counters.new_cookies) if day % 7 >= 5]
     expected = mean(world.WEEKLY_PROFILE_PERCENT[5:]) / mean(
@@ -250,7 +250,7 @@ def test_the_influx_differs_even_on_the_same_weekday():
 def test_the_influx_is_visible_on_the_plan():
     """Накопленная аудитория растёт с горизонтом и с дневной не сходится."""
     week = plan.counters(CANONICAL_SEED, 7)
-    fortnight = plan.counters(CANONICAL_SEED, SNAPSHOT_DAYS)
+    fortnight = plan.counters(CANONICAL_SEED, WINDOW_DAYS)
     assert week.visitors < fortnight.visitors
     assert fortnight.visitors > 2 * max(fortnight.audience)
 
@@ -258,21 +258,21 @@ def test_the_influx_is_visible_on_the_plan():
 def test_the_horizon_is_a_prefix_not_another_world():
     """Продление истории днём N+1 не трогает дни 1…N."""
     week = plan.counters(CANONICAL_SEED, 7)
-    fortnight = plan.counters(CANONICAL_SEED, SNAPSHOT_DAYS)
+    fortnight = plan.counters(CANONICAL_SEED, WINDOW_DAYS)
     assert fortnight.audience[:7] == week.audience
     assert fortnight.new_cookies[:7] == week.new_cookies
 
 
 def test_counters_count_the_same_audience_that_the_day_gets():
     """Счётчики и дня-функция спрашивают один план — расходиться им негде."""
-    counters = plan.counters(CANONICAL_SEED, SNAPSHOT_DAYS)
-    for day in (0, 7, SNAPSHOT_DAYS - 1):
+    counters = plan.counters(CANONICAL_SEED, WINDOW_DAYS)
+    for day in (0, 7, WINDOW_DAYS - 1):
         actual = plan.audience(CANONICAL_SEED, day).client_id.size
         assert actual == counters.audience[day]
 
 
 def test_counters_know_the_pairs_before_a_single_event():
-    counters = plan.counters(CANONICAL_SEED, SNAPSHOT_DAYS)
+    counters = plan.counters(CANONICAL_SEED, WINDOW_DAYS)
     assert counters.pairs > 0