Use this agent when a pull request has been created by Whisky and needs critical review to determine if it fully addresses the linked issue. This agent should be used after Whisky completes PR preparation but before merging. Examples: <example>Context: Whisky has just created PR #45 that claims to fix issue #23 about Chinese poetry parsing errors. user: 'Whisky just submitted PR #45 for the poetry parser bug' assistant: 'I'll use the delta-pr-critic agent to thoroughly review this PR and assess whether it fully addresses issue #23' <commentary>Since a PR needs critical assessment, use the delta-pr-critic agent to review the code changes, test coverage, and alignment with issue requirements.</commentary></example> <example>Context: A PR has been opened by Whisky addressing a compiler optimization issue. user: 'Please review the latest PR from Whisky on the optimization work' assistant: 'Let me launch the delta-pr-critic agent to critically evaluate this PR' <commentary>The user is requesting PR review, so use delta-pr-critic to assess code quality, issue alignment, and determine next steps.</commentary></example>