Add resyntax fix --output-as-json flag

[Copilot]

Adds JSON output format to resyntax fix for the Autofixer to programmatically determine if fixes were applied.

Changes

• Added json variant to resyntax-output-format enum
• Added --output-as-json CLI flag
• Implemented resyntax-fix-print-json function that outputs:

  {
    "commit_message": "Automated Resyntax fixes\n\nResyntax fixed 3 issues in ...",
    "fix_count": 3
  }

• When no fixes found:

  {
    "commit_message": "Resyntax found no issues.",
    "fix_count": 0
  }

The commit_message field contains a formatted Git commit message with fix counts by rule. The fix_count field enables the Autofixer to bail out when zero.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add resyntax fix --output-as-json flag</issue_title>
<issue_description>This is an internal flag for the Autofixer, which should print out the summary information in the form of a JSON object. That object should look something like this:

{
  "commit_message" : "Automated Resyntax fixes\n\nResyntax fixed 3 issues in ...",
  "fix_count" : 3
}

The Autofixer needs this in order to safely bail out of the autofixing workflow if no issues are found.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add resyntax fix --output-as-json flag #667

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