metaagent session-005: METASTATE + HANDOFF

- All 7 tasks archived (T1-T7 in .agent/archive/tasks/)
- All 7 requests approved and moved to .agent/archive/requests/
- .agent/archive/index.json created
- .agent/context/project-state.md updated (post-refactor snapshot)
- .agent/handoff-summary.md (full summary for next agent)
- .agent/session-summary.md (phase-level summary)
- .agent/roadmap/sources.md (updated priorities)
- .agent/checkpoints.json: handoff=completed

All 8 phases completed: INIT, ANALYSE, ROADMAP, DECOMPOSITION,
EXECUTION, METASTATE, HANDOFF (DESIGN skipped for existing project).

.agent/archive/requests/req-T4.json

@@ -0,0 +1,35 @@
+{
+  "request_id": "req-T4",
+  "task_id": "T4",
+  "title": "Repository pattern — ModelRepository, JsonFileRepository, ExcelRepository",
+  "status": "ready_for_review",
+  "goal": "Абстрагировать хранилище FinancialModel через Protocol, подготовить к БД/API",
+  "changes": {
+    "summary": "Создан application/repositories/ с ModelRepository Protocol (runtime_checkable). Реализации: infrastructure/repositories/JsonFileRepository (.json с version) и ExcelRepository (бывший ExcelSync, переименован). FinancialModel.save/load удалены — класс хранит только данные. infrastructure/sync/ удалён. CLI (main.py, config.py) использует JsonFileRepository + ExcelRepository через локальные singletons. test_excel_sync.py обновлён на ExcelRepository. Новый test_repositories.py: 5 тестов.",
+    "commits": ["<see git log>"],
+    "files_changed": [
+      "application/repositories/__init__.py, model_repository.py (new)",
+      "infrastructure/repositories/__init__.py, json_file_repository.py, excel_repository.py (new)",
+      "infrastructure/sync/ (removed)",
+      "domain/model.py (save/load удалены)",
+      "infrastructure/cli/main.py, config.py (используют repositories)",
+      "tests/test_excel_sync.py, test_model.py, test_repositories.py (new)"
+    ]
+  },
+  "verification": {
+    "tests_passed": "68/68",
+    "new_tests": 5,
+    "json_repo_roundtrip": "ok",
+    "excel_repo_roundtrip": "ok",
+    "cf_init_works": true,
+    "cf_export_import_xlsx_works": true
+  },
+  "fulfills_ac": [
+    "ModelRepository Protocol определён",
+    "JsonFileRepository реализует Protocol",
+    "ExcelRepository реализует Protocol",
+    "FinancialModel.save/load удалены",
+    "Тесты на каждый репозиторий",
+    "pytest 68/68"
+  ]
+}