Improve log search and suppress no-reply skill loops

[rahulchhabria]

Summary

• search structured log fields in ash-sb logs instead of only the top-level message
• suppress exact child skill [NO_REPLY] results in Telegram orchestration instead of feeding them back into the main agent
• add focused regression coverage for both behaviors

Testing

• ./.venv/bin/pytest tests/test_logs_command.py -q
• ./.venv/bin/pytest tests/test_providers.py -q -k suppresses_skill_no_reply
• python -m py_compile src/ash/cli/commands/logs.py src/ash/providers/telegram/handlers/message_handler.py tests/test_logs_command.py tests/test_providers.py