docs(readme): add diffnav to the comparison table

[benvinegar]

Summary

• add diffnav to the README feature comparison table between Lumen and Difftastic
• verify each capability entry against the diffnav project docs/source before updating the row values

Testing

• docs-only change
• manually verified diffnav capabilities from its repository

This PR description was generated by Pi using OpenAI o3

[greptile-apps]

Greptile Summary

This PR adds diffnav as a new column to the feature comparison table in README.md, positioned between lumen and difftastic. The capability values assigned to diffnav (interactive TUI with file-tree sidebar, mouse support, syntax highlighting via delta, pager-compatible) align with what the tool publicly documents about itself.

One thing worth confirming: diffnav is consistently described by its own maintainer as a git diff pager built on top of delta — not a dedicated review-first tool. Marking it ✅ for "Review-first interactive UI" alongside hunk and lumen is plausible given it opens a navigable TUI, but it may overstate the tool's positioning relative to tools like delta that received ❌ for the same row.

Confidence Score: 5/5

Safe to merge — docs-only change with one minor debatable capability assertion.

All findings are P2 (style/accuracy suggestion). The only question is whether diffnav's "Review-first interactive UI" ✅ is the right call; everything else in the new column checks out against publicly available documentation. No code is affected.

README.md — specifically the "Review-first interactive UI" row for the diffnav column.

Important Files Changed

Filename	Overview
README.md	Adds diffnav column to the feature comparison table; capability values are broadly consistent with diffnav's public docs, though "Review-first interactive UI" ✅ is debatable given diffnav self-describes as a pager.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[README.md feature table] --> B[hunk column]
    A --> C[lumen column]
    A --> D[diffnav column — NEW]
    A --> E[difftastic column]
    A --> F[delta column]
    A --> G[diff-so-fancy column]
    A --> H[diff column]

    D --> D1["Review-first interactive UI ✅"]
    D --> D2["Multi-file review stream + sidebar ✅"]
    D --> D3["Inline agent / AI annotations ❌"]
    D --> D4["Responsive auto split/stack layout ❌"]
    D --> D5["Mouse support inside the viewer ✅"]
    D --> D6["Runtime view toggles ✅"]
    D --> D7["Syntax highlighting ✅"]
    D --> D8["Structural diffing ❌"]
    D --> D9["Pager-compatible mode ✅"]

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_{Reviews (1): Last reviewed commit: "docs(readme): add diffnav to the compari..." | Re-trigger Greptile}

[greptile-apps]

"Review-first interactive UI" ✅ for diffnav may be overstated

diffnav is consistently described — by its own README and third-party listings — as a git diff pager built on top of delta, not a dedicated review-first tool. delta received ❌ for this row, yet the two tools share the same underlying renderer. The meaningful differentiator for diffnav over delta is the file-tree sidebar, which is captured separately in the "Multi-file review stream + sidebar" row. Worth double-checking whether the ✅ here is intentional or whether ❌ (matching delta) better fits the table's intended distinction between pager-style tools and interactive review UIs.