Implement posterior level concealment

[arthurmloureiro]

We need to implement a way to conceal the chains too!

This will require us to move the smokescreen namespace to have something like:
import smokescreen.ConcealDataVector and import smokescreen.ConcealPosterior to conceal at different levels.

[arthurmloureiro]

• Carlos GG sent some cobaya chains!
• Jessie sent me cosmosis chains

[arthurmloureiro]

Discussions from Telecon on 2024-11-12

• What do we do with parameters that are prior bounded? these can give away any shifts (@jessmuir has an implementation from the DES analysis for these cases)
• Multi-chain support
• Two different shifts:
  • absolute shifts $\Delta \theta$ centered at zero
  • relative shifts with relation to a fiducial value or a chain such that model comparison can be done (@jessmuir has some examples of how to do this).
• Include also an "exclusion list" to avoid shifting some desired parameters

[arthurmloureiro]

Jessie sent the DES scripts via slack here