feat: add co-author support and bot filtering to contributors

[myelinated-wackerow]

Summary

Contributor lists previously only showed primary commit authors, missing anyone credited via Co-authored-by: trailers. This expands attribution to include co-authors and filters out bots/AI agents.

What changed

• Co-author parsing -- Extract Co-authored-by: trailers from commit messages and include co-authors in page contributor lists
• Bot/AI filtering -- Exclusion lists for AI agents (Claude, Copilot, Gemini, etc.) and bots (dependabot, netlify, etc.) to keep contributor lists human-only
• Ported to data-layer -- Co-author logic lives in fetchGitHubContributors.ts (the data-layer fetcher from Move GitHub contributors fetching to scheduled data-layer task #17174), not the old gh.ts
• Co-author resolution chain -- For each co-author trailer:
  1. Try extracting login from GitHub noreply email
  2. Match display name against .all-contributorsrc (1,500+ known contributors)
  3. Fall back to trailer name with initials avatar (no profile link)
• Avatar URL fix -- Use avatars.githubusercontent.com/{login} instead of the API's /u/{id}?v=4 format, which causes redirect loops with Next.js image optimization
• No-profile contributor support -- FileContributors component handles contributors without GitHub accounts (initials fallback, name without @ prefix, no broken link)

Excluded patterns

Logins: dependabot[bot], github-actions[bot], allcontributors[bot], netlify[bot], crowdin-bot, eth-bot, ethereumoptimism-bot, coderabbitai[bot]

Name patterns (case-insensitive): claude, copilot, gpt, chatgpt, openai, cursor, codeium, tabnine, amazon q, cody, gemini, coderabbit

Emails: noreply@anthropic.com, copilot@github.com, bot noreply addresses

Files changed

• src/data-layer/fetchers/fetchGitHubContributors.ts -- co-author parsing, bot filtering, name lookup, avatar URL fix
• src/components/FileContributors.tsx -- no-profile contributor rendering (initials fallback, conditional link/label)

Test plan

• Contributor avatars load correctly (username-based URLs)
• No-profile contributors show initials fallback (e.g., "JA" for John Anon)
• No-profile contributors show name without @ prefix in modal
• Run trigger.dev task and compare output against raw GitHub API to confirm bots are excluded (filtering happens at fetch time, not render time -- mock data bypasses the fetcher)
• Confirm co-authors with GitHub noreply emails appear in contributor lists
• Confirm co-authors resolved via .all-contributorsrc name match get proper avatars

Generated with Claude Code

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