Suppress IBKR no-op window notifications

[Pigbibi]

Summary

• suppress Telegram heartbeat notifications when a strategy returns no-op because it is outside the execution window
• keep reconciliation records and structured log output for those skipped cycles
• cover monthly snapshot no-op behavior in tests

Validation

• PYTHONPATH=/home/ubuntu/Projects/QuantPlatformKit/src:/home/ubuntu/Projects/UsEquityStrategies/src PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 .venv/bin/python -m pytest -q tests/test_execution_service.py tests/test_strategy_runtime.py tests/test_rebalance_service.py tests/test_request_handling.py
• .venv/bin/python -m ruff check application/rebalance_service.py tests/test_rebalance_service.py application/execution_service.py strategy_runtime.py notifications/renderers.py notifications/telegram.py tests/test_execution_service.py tests/test_strategy_runtime.py
• git diff --check