docs(readme): lead the pr-af card with its Code-Review-Bench result

[oktaygoktas]

Summary

The Built With AgentField card for pr-af was showing the older "Open-Source Agentic PR Review" architecture diagram. This swaps it for the repo's current hero image — the Code-Review-Bench chart — and brings the card's copy and link in line with the rest of the grid.

• New image — assets/examples/agentic-pr-reviewer-hero.png, taken from Agent-Field/pr-af's assets/hero.png. Same 16:9 aspect ratio as the image it replaces (1376×768 vs 2752×1536), so the two-column grid renders unchanged, and it's 1.0 MB instead of 4.6 MB.
• Previous image kept — assets/examples/agentic-pr-reviewer.png is untouched and stays in the repo.
• Caption rewritten to lead with the result the image states, then keep the mechanism in one clause.
• Link normalized from agentfield.ai/pr-af/ to agentfield.ai/github/pr-af/, the form every other card uses. utm_id is unchanged (github-readme-pr-af-repo), so analytics continuity is preserved.
• assets/utm-links.csv — pr-af was the only "Built with AF" card missing from the manifest; added its row.

Caption

Before:

Builds a custom review strategy for every PR - spawns parallel reviewer agents with runtime-crafted prompts, adversarially challenges its own findings, and posts evidence-grounded inline comments.

After:

#1 open-source reviewer on Code-Review-Bench - 0.706 golden recall across 42 tools compared, at ~10x lower cost per review. Builds a custom review strategy for every PR, then adversarially challenges its own findings.

Both figures come from pr-af's own README ("PR-AF with GLM-5.2 is the #1 open-source reviewer in golden recall: 0.706 across 42 compared tools") and the image ("About 10x cheaper per review than closed-source tools"). The claim is scoped to open-source deliberately — cubic-dev scores 0.741 and is closed-source, so an unqualified "#1" would be inaccurate.

Verification

• Both agentfield.ai/pr-af/ and agentfield.ai/github/pr-af/ return 200 and resolve to https://github.com/Agent-Field/pr-af, so the link change breaks nothing.
• assets/examples/agentic-pr-reviewer.png had exactly one reference in the repo (the line changed here); no other file points at it.
• Image stored under assets/examples/ as kebab-case PNG, matching the convention used by all six cards.

Note

assets/utm-links.csv remains incomplete relative to the README overall — only the pr-af row is added here, since that's what this change touches.

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