Feat: Improve Issue Fixer Rules for Targeted Fixes

[daniel-lxs]

This PR refines the rules for the Issue Fixer mode to ensure a stronger focus on high-quality, targeted fixes. The goal is to guide the mode to resolve the specific problem described in a GitHub issue without introducing unrelated changes or refactoring.

This was achieved by updating the workflow and best practices to emphasize:

• Narrow Scope: The implementation plan and execution are now strictly focused on the minimal changes required to fix the bug.
• Quality over Hacks: While the scope is narrow, the rules encourage robust solutions over quick, one-line hacks.

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Important

Refines Issue Fixer rules to focus on high-quality, targeted fixes by updating workflow and best practices for narrow scope and quality solutions.

• Workflow Updates:
  • In 1_Workflow.xml, updated bug fix steps to focus on high-quality, targeted fixes without unrelated changes.
  • Emphasized narrow scope and quality over hacks in bug fix implementation.
• Best Practices:
  • In 2_best_practices.xml, added focus on addressing issue requirements exclusively.
  • Stressed minimal, high-quality changes for bug fixes, avoiding one-line hacks.

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