chore(micro-fix): fix debug logging level in graph executor

[Nihal-a]

Type: Micro-fix

This PR adjusts a debug logging statement to use the appropriate logging level.

Changes

• Changed logger.info() to logger.debug() in core/framework/graph/executor.py:371
• Removed redundant "🔍 Debug:" prefix from log message
• Total lines changed: 1

Why This Qualifies as a Micro-fix

✅ < 20 lines changed (only 1 line)
✅ No logic, API, or database changes
✅ Linting/cleanup category (logging best practices)
✅ Zero risk of breaking changes

Per CONTRIBUTING.md, micro-fixes can be submitted without prior issue assignment.

Problem

Debug-level information was appearing in production logs at INFO level, adding noise to log output.

Solution

Use the appropriate debug logging level so the message only appears when debug logging is explicitly enabled.

Testing

• ✅ ruff check passes (linting) - all files clean
• ✅ ruff format --check passes (formatting) - 239 files already formatted
• ✅ pytest tests/ passes - 683 tests passed, 0 failed

Checklist

• Follow conventional commit format
• Changes limited to < 20 lines
• No functional changes
• Lint and tests pass
• Marked as micro-fix for fast-track review

[micro-fix,code-quality,logging,chore]