Prepares the review components for the backend phase that returns
metadata-only file lists from getPhaseReviewDiff. FileDiff now holds
only path/status/additions/deletions; FileDiffDetail extends it with
hunks. Renames changeType→status and adds 'binary' to the union.
Also fixes two pre-existing TypeScript errors: InitiativeReview was
passing an unknown `comments` prop to DiffViewer (should be
commentsByLine), and ConflictResolutionPanel destructured an unused
`agent` variable.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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