docs: generalize pairwise mechanism page

[kronosapiens]

Summary

Reframes the Pairwise mechanism page to describe pairwise as a general family of preference aggregation methods rather than a single tool/deployment. The current page reads as if Pairwise == pairwise.vote (formerly Budget Box) — this update broadens the scope while keeping the entry encyclopedia-style.

Changes

• Title: Pairwise (formerly Budget Box) → Pairwise. The "formerly Budget Box" lineage is specific to the Colony / pairwise.vote tool, not the mechanism itself.
• shortDescription rewritten to frame the page as a family of methods.
• New section: Two Modes — Estimation and Aggregation. Distinguishes recovering a hidden ground truth (e.g. LLM evaluation, chess) from synthesizing intentional preferences (e.g. funding allocation).
• New section: Origins. Thurstone (1927) → Elo → PageRank → recent web3 deployments — grounds the mechanism as a mature technique, not a crypto novelty.
• How It Works expanded to acknowledge pair-selection strategies and name the main aggregation algorithms (Bradley-Terry, Elo, spectral / PageRank-style).
• Advantages and Limitations sharpened; noted that smart pair selection can mitigate the k² scaling concern.
• Examples broadened: kept Optimism Retro Funding (now noting Bradley-Terry aggregation), added Deep Funding (2024), All Our Ideas / NYC PlaNYC 2030, and Chatbot Arena / LLM evaluation. Dropped vague "General Fund" reference.
• Further Reading — added Salganik & Levy (2015), Kronovet/Fischer/du Rose (2018, the original onchain framing), and a recent overview essay.
• Added authors: ["Daniel Kronovet"] to the page (and added the corresponding entry to src/data/authors.json).

Test plan

• npx tsx scripts/validate-content.ts src/content/mechanisms/pairwise.md passes with no warnings
• Render /mechanisms/pairwise in npm run dev and confirm formatting and links

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