[SuprexDE]

Takes over #86 by @Creacken (original commit kept), adds the credits and fixes a small placement issue.

Changes

• Contributor: adds 7 syringe containers, 4 secret-door markers, 2 more generator spawns, a gas can and 7 poster locations. Replaces the ladder at the start of the map (f1-ladder-15) with a co-op move (obstacle).
• Maintainer fix: the four secret-door markers (pl-0089, pl-0090, pl-0091, pl-0093) were 2.5 to 5 units off the doors they mark. They now sit exactly on ug-door-65, f1-door-34, f1-door-26 and f1-door-52, like the secret doors in Locksock the Warden.
• Credits Creacken in the Police Station meta.authors and in contributors.json (profile 38e23084-d904-15f7-d4ec-4227d8f7a410).

Notes

• f1-vault-window-02 moved from y=545 to y=540, which the description doesn't mention. It still sits on the wall, so I left it as is.
• The new co-op obstacle is the only single one in this trial; all the others come in facing pairs. Does this boost only work in one direction?

Checks

validate:data, lint, format:check, typecheck, build: all pass locally.

Closes #86