chore(master): release 3.1.0

[github-actions]

🤖 I have created a release beep boop

3.1.0 (2025-05-09)

Features

• add colors to nixago logs (#48) (8c1f9e5)
• allow extra attributes that are transparently passed through (#32) (59843d3)
• automatically add linked files to gitignore (#43) (e157f2e), closes #27
• factorize shell scripts so that they can be composed more freely (#40) (dd3c333)
• locate the request file, if possible (#30) (f904f54)
• provide a stand-alone installation runnable for every hook (#41) (8aa25d6)
• reify requests (#42) (1c8f4b3)
• request: default format value to file extension (#37) (c893573), closes #28

Bug Fixes

• 1000 nixpkgs; compat with numtide/nixpkgs-unfree (#51) (d686345)
• core: recover the unbound freeformType contract per module system (#34) (1640dd9)
• don't leave traces in the hook's environment (#46) (21272c3), closes #45
• ensure gitignore entries are relative to root (#54) (1da60ad)
• hook: creates relative paths before linking/copying (#36) (0fb7666), closes #33
• Only update .gitignore when a link is indeed created (#56) (5133633)
• run extra in subshell so that the environment is not messed up (#44) (608abdd)
• the quickstart guide (#35) (3a5cb34)
• unbound variable (#55) (dacceb1)

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