How to fetch PR review comments using gh api. Triggers when the user asks the agent to look at review comments on a specific PR (by number or by referencing "the PR"/"my PR"). Examples: "got comments on PR 123, which should we address", "check the review feedback on the PR", "triage the PR comments". Do NOT trigger when the user pastes a raw gh command — that's a manual action, not a request for the agent to fetch and analyze.
