feat: add preview review reference and update interactive iterate step

[johnnygreco]

Summary

• Add references/preview-review.md with structured guidance for reviewing dataset previews (diversity, data quality, design choices)
• Update interactive workflow iterate step to offer self-review and reference the new guide
• Remove stale "and serve again" wording from iterate step

[greptile-apps]

Greptile Summary

This PR adds a new references/preview-review.md guide providing structured criteria for reviewing dataset previews (diversity, data quality, design choices), and updates the interactive workflow's Iterate step to proactively offer self-review using that guide. It also removes stale "serve again" wording.

• New reference guide (references/preview-review.md): Well-structured across three categories — Diversity (mode collapse, sampler effectiveness, structural monotony), Data Quality (instruction compliance, consistency, encoding, plausibility, judge calibration), and Design Choices — with a clear statistical-mindset framing.
• Interactive workflow updated: Iterate step now breaks out into sub-bullets, adds an offer to self-review, and links to the new guide for guidance. The path references/preview-review.md resolution from within workflows/interactive.md was already flagged in a prior review thread.
• Autopilot workflow not updated: The autopilot.md workflow also has a Preview step and a re-iterate path in its final Present step, but it does not reference the new review guide. If proactive self-review is valuable for interactive mode, it may be worth considering whether autopilot.md should also leverage the guide during its own iteration loop.

Confidence Score: 4/5

• Safe to merge — documentation-only changes with no functional code impact.
• The changes are purely additive documentation updates (a new reference guide and a wording improvement to the interactive workflow). No code logic is altered, no regressions are possible, and the guide content is accurate and well-structured. The one minor open question is whether the autopilot workflow should also reference the new guide, but that does not block this PR.
• No files require special attention.

Important Files Changed

Filename	Overview
skills/data-designer/references/preview-review.md	New reference guide for reviewing dataset previews. Content is well-structured across three categories (Diversity, Data Quality, Design Choices) with clear mindset guidance. No issues found.
skills/data-designer/workflows/interactive.md	Iterate step updated to add self-review offer and reference the new preview-review guide. The path references/preview-review.md may require careful resolution depending on how the agent resolves relative paths from this file's directory (already flagged in a previous review thread). The autopilot workflow is not updated with the same capability.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Step 6: Preview\nrun data-designer preview --save-results] --> B[Step 7: Iterate]
    B --> C[Ask user for feedback]
    B --> D[Offer self-review]
    D -->|User accepts| E[Read references/preview-review.md]
    E --> F{Review Categories}
    F --> G[Diversity\nMode collapse, sampler\neffectiveness, structural monotony]
    F --> H[Data Quality\nInstruction compliance, consistency,\nencoding, plausibility, judge calibration]
    F --> I[Design Choices\nColumn type appropriateness,\nsampler usage]
    G --> J[Suggest improvements]
    H --> J
    I --> J
    D -->|User declines| K[Apply user feedback]
    J --> K
    C --> K
    K --> L[Re-validate]
    L --> M[Re-preview]
    M --> N{User satisfied?}
    N -->|No| B
    N -->|Yes| O[Step 8: Finalize]

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