Remove monthly automation from strategy repo

[Pigbibi]

Summary

• Delete monthly optimization and auto-merge workflows from the non-snapshot strategy repo
• Remove the unused monthly automation helper and tests
• Document that monthly report audit/remediation belongs in snapshot artifact repos

Tests

• PYTHONPATH=/home/ubuntu/Projects/CryptoStrategies/src:/home/ubuntu/Projects/QuantPlatformKit/src python -m unittest discover -s tests -p 'test_*.py'
• python -m py_compile \src/crypto_strategies/entrypoints/init.py
  src/crypto_strategies/strategies/crypto_leader_rotation/core.py
  src/crypto_strategies/strategies/crypto_leader_rotation/rotation.py
  src/crypto_strategies/strategies/crypto_leader_rotation/init.py
  src/crypto_strategies/strategies/init.py
  src/crypto_strategies/runtime_adapters.py
  src/crypto_strategies/catalog.py
  src/crypto_strategies/manifests/init.py
  src/crypto_strategies/init.py
• git diff --check