docs: TUI status strip, log panel, and export design spec

[bschellenberger2600]

Summary

• Adds a design spec for TUI status strip, log panel, and session export parity with git-fire
• Defines the JSONL LogEntry session contract, event-driven status strip, ring-buffer log panel, and user-initiated export paths
• Preserves the mandatory TUI-then-CLI split (runRainTUIStream → runRainOnRepos) for post-selection fetch/sync work

Test plan

• Review design doc for alignment with git-fire cross-reference spec
• Confirm TUI-then-CLI requirement matches current cmd/root.go behavior
• No code changes in this PR — implementation follows in a separate branch

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5a8c8811-3dd2-42e2-9618-9ce671d52a54

📥 Commits

Reviewing files that changed from the base of the PR and between 3d29d11 and ee01295.

📒 Files selected for processing (2)

• .cursor/BUGBOT.md
• docs/superpowers/specs/2026-04-19-tui-status-log-export-design.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch design/tui-status-log-export-spec

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[cursor]

Not approving: Cursor Bugbot completed successfully, but no Cursor[bot] PR review comment with the required signal was found on this PR. Human review is needed before merge. No additional reviewers were assigned (solo maintainer repo).

  

_{Sent by Cursor Approval Agent: Pull Request Approver}

[cursor]

Did not approve: Cursor Bugbot completed successfully but no Cursor[bot] review comment with the expected signal was posted on this PR. Human maintainer review is still appropriate for this design spec; no additional reviewers were assigned (solo maintainer repository).

  

_{Sent by Cursor Approval Agent: Pull Request Approver}

[cursor]

Approved: Cursor Bugbot passed with no findings on this documentation-only PR. No additional reviewers were assigned.

  

_{Sent by Cursor Approval Agent: Pull Request Approver}