feat(code): show PR comments in review panel

[adboio]

Problem

let's help our users get their PRs across the finish line

Changes

[only for cloud tasks right now - will bring over to local later too, just a bit differently]

• displays github PR comments in the review panel
• adds agent buttons for "fix with agent" and "ask agent"
  • ^ this is behind a feature flag because the cloud resume stuff is a bit busted, and enabling it just creates a poor experience. i'll enable once we fix that
• allows replying to github comments from the UI

How did you test this?

manually

[adboio]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(code): show PR comments in review panel #1536 👈 (View in Graphite)
• refactor sending prompt to agent from UI #1539
• chore: add relative time utils #1535
• feat(code): add PR status and actions to cloud tasks #1525
• fix(code): truncate text properly in tool call output #1498
• feat(code): remove right sidebar #1497
• feat(code): tree view for changed files list #1494
• feat(code): use remote files for cloud review panel #1491
• feat(code): remove cloud status bar, add pr view button #1476
• main

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