fix: replace print() with logger.warning() in new_workflow() and _register_with_scheduler()

[amathxbt]

Bug Fix: Replace print() with logger.warning() in alpha.py — diagnostic messages bypass logging configuration

Summary

Two places in alpha.py use print() for diagnostic output instead of the logger used everywhere else in the SDK. This means these messages bypass any log handler the user has configured and are completely invisible in non-interactive environments.

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Bug 1 — new_workflow() gas estimation fallback

# BEFORE — prints to stdout, bypasses logging
except Exception as e:
    print(f"Gas estimation failed: {str(e)}")
    gas_limit = 5000000  # Conservative fallback
    print(f"Using fallback gas limit: {gas_limit}")

# AFTER — uses logger, visible in log files and monitoring
except Exception as e:
    logger.warning("Gas estimation failed: %s. Using conservative fallback gas limit of 5,000,000.", e)
    gas_limit = 5000000  # Conservative fallback

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Bug 2 — _register_with_scheduler() failure

# BEFORE — prints to stdout, no contract address context
except Exception as e:
    print(f"Error registering contract with scheduler: {str(e)}")
    print("  The workflow contract is still deployed and can be executed manually.")

# AFTER — uses logger, includes contract_address for traceability
except Exception as e:
    logger.warning(
        "Failed to register workflow contract %s with scheduler: %s. "
        "The contract is still deployed and can be executed manually.",
        contract_address,
        e,
    )

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Why This Matters

	print()	logger.warning()
Visible in log files	❌	✅
Works in daemon/container environments	❌	✅
Suppressible via log level	❌	✅
Visible in monitoring/alerting systems	❌	✅
Consistent with rest of SDK	❌	✅

Any user running the SDK as a service (Docker container, background process, anything with redirected stdout) would silently lose these warnings — including the critical gas estimation fallback message that tells them their transaction is using a 5M gas conservative limit instead of the estimated amount.

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Affected Methods

• Alpha.new_workflow() — gas estimation failure path
• Alpha._register_with_scheduler() — scheduler registration failure path

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@adambalogh @kylexqian — two print() calls that should be logger.warning(). Also added contract_address to the scheduler error message for better traceability. 🙏