June 2026 Dead Code Cleanup

[fira]

About the pull request

This just removes dead code from the game, that is presumably not usable at all in the game builds.

Some highlights:

• Removes Crash/Dropship logic from old Shuttle backend - unfortunately it can't be completely removed because the ASRS Supply elevator still uses old shuttles
• Removes DOREC specific code that hasn't been used for a decade
• Removes orphaned admin tools backend that weren't actually usable
• Removes species handlers that weren't actually used at all
• Removes speech change pathogen (and the associated templated bottle) that actually didn't do anything because nothing cares about special_voice

Explain why it's good for the game

Especially removal of duplicated explosion and shuttle code make it easier for newer contributors to pick things up and navigate the codebase, without getting also misled by antique code that is out of standards.

Changelog

🆑
code: Removed unused game code.
/:cl:

[fira]

Get #12412 first

[cm13-github]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[cmss13-ci]

This PR has been inactive for long enough to be automatically marked as stale. This means it is at risk of being auto closed in ~ 7 days, please address any outstanding review items and ensure your PR is finished, if these are all true and you are auto-staled anyway, you need to actively ask maintainers if your PR will be merged. Once you have done any of the previous actions then you should request a maintainer remove the stale label on your PR, to reset the stale timer. If you feel no maintainer will respond in that time, you may wish to close this PR youself, while you seek maintainer comment, as you will then be able to reopen the PR yourself