[rhiever]

Summary

fmsave takes contributions through issues rather than pull requests, so people who helped haven't shown up as contributors. This change credits them and writes down how future changes will do the same.

• README: a new Contributors list.
• CHANGELOG: past release entries now thank the people whose reports, requests, testing and findings fed them. The 0.6.0 line now says "for the archive lead", which matches its release notes.
• CONTRIBUTING: explains that changes come in through issues, how credit works (co-author, changelog, README, a mention on the PR), and how to opt out. The PR template says the same.
• AGENTS.md: a "Crediting contributors" section, so future changes credit people consistently. It includes a squash-merge step that keeps the co-author trailers.
• Squash commit: carries a Co-authored-by trailer for each past contributor.

Thank you all for helping make fmsave better: @1e16miin @BWH95 @Buglerru @GetChatGPTToDoIt @hostlund @jeohist @johnmmcparland @jtstothard @kdr6989 @matthiasvetter1104 @Namhahaha1110 @OdumWorld @thaffy

Checklist

• Docs only; no reader behavior changes.
• This change holds no real data: no save files or fragments, screenshots, or real names, uids or values from any save.
• I derived format knowledge only from my own saves and the game UI (no decompilation, leaked or non-disclosure material, or code from unlicensed parsers).
• uv run pytest, the docs build and the distribution check pass.

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