ForwardDispersion Model for MIRI and make MIRI and NIRISS use the same method

[jemorrison]

Helps to resolve Resolves JP-3942

Closes #

This PR addresses updates the Forward model used for MIRWFSS. The Forward model for both NIRISS and MIRI are the same. The private module's name was changed to WFSSForwardGrismDistortion

Tasks

• update or add relevant tests
• update relevant docstrings and / or docs/ page
• Does this PR change any API used downstream? (if not, label with no-changelog-entry-needed)
  • write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see below for change types)
  • run jwst regression tests with this branch installed ("git+https://github.com/<fork>/stdatamodels@<branch>")
    Regression tests passed
    https://github.com/spacetelescope/RegressionTests/actions/runs/18507985858

news fragment change types...

• changes/<PR#>.feature.rst: new feature
• changes/<PR#>.bugfix.rst: fixes an issue
• changes/<PR#>.doc.rst: documentation change
• changes/<PR#>.removal.rst: deprecation or removal of public API
• changes/<PR#>.misc.rst: infrastructure or miscellaneous change

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.10%. Comparing base (2f233c2) to head (713e48f).
⚠️ Report is 104 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #600      +/-   ##
==========================================
- Coverage   90.13%   90.10%   -0.03%     
==========================================
  Files         111      111              
  Lines        5321     5306      -15     
==========================================
- Hits         4796     4781      -15     
  Misses        525      525              

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[emolter]

I am fine with the name WFSSForwardDispersion.

I think the fact that MIRI and NIRISS but not NIRCam will share code means a bit of messiness is unavoidable in the naming. In my opinion it's not worth the trouble to change the names of anything non-MIRI-related, since those are already in active use.

[emolter]

Also since looking at the PR the only things that need to be changed are "private", these name changes should be non-controversial

[emolter]

@jemorrison it looks like the docs build is failing because you need to add any new classes to the ignores list here:

stdatamodels/docs/source/conf.py

Line 63 in b4fda16

for transform_base in [

(and please do remove any old ones)

Please do also add a changelog entry saying something about the forward dispersion model bugfix

[jemorrison]

@emolter When you say do not remove old ones from conf.py - do you also mean do not remove _NIRISSForwardGrismDispersion ?
I changed that no to WFSSForwardGrismDispersion so the old one is no longer in stdatamodels - so it seems
I should remove that one. But I just wanted to double check.

[emolter]

No I didn't say don't remove old ones, please do remove any names that are now unused

[jemorrison]

Sorry I read you comment before my coffee this morning. Got it now

[emolter]

Other than one suggestion about the changelog this looks good to me.

[jemorrison]

regression test passed: https://github.com/spacetelescope/RegressionTests/actions/runs/18507985858