Retry BTC market snapshot fetch

[Pigbibi]

Summary

• Add bounded retry support when resolving the live BTC market snapshot.
• Wire the Binance runtime to retry BTC daily fetches up to 3 times by default with short backoff.
• Add localized retry log messages and unit coverage for retry success/failure paths.

Root Cause

A transient timeout from api.binance.com caused BTC daily indicators to return None, which correctly stopped the strategy cycle but made a single external API timeout fail the whole Runtime workflow.

Validation

• python -m unittest tests.test_binance_runtime_infra tests.test_market_snapshot_support tests.test_main_runtime_error_notification
• git diff --check