fix(PR List Commits): not including links

[mikewuu]

• Introduced a new variable toolAnswer in get-answer.ts to store exact answers from tools
• Implemented the onAnswer callback in get-list-commits-deployed-to-branch-tool.ts to pass exact answers back to getAnswer
• Modified getAnswer to prefer toolAnswer over the LLM output if available
• Updated commit processing in get-list-commits-deployed-to-branch-tool.ts to handle merged_at instead of created_at for better date formatting