CLEANUP: Remove field 'envir' from Future objects

[HenrikBengtsson]

The envir field of Future objects is going away. It's not needed. It's just an as-is record of the envir argument of future(). The envir argument is used to look up globals via environment envir, which happens when the future is created. After that, envir is not longer needed.

Packages that rely on the envir field

CRAN

• civis 3.1.3 (2025-08-29)
  • GitHub issues: future: internal field 'envir' is going away, which breaks 'civis' [PATCH] civisanalytics/civis-r#262 (2025-12-03)
  • Patch PR#261
  • Fixed version on CRAN

[HenrikBengtsson]

Fixed in civis 3.1.4 - removed special workaround.