test: re-port adapt-image jax likelihood scripts after pytree fix

[Jammy2211]

Summary

Re-enables adapt-image jax likelihood smoke tests for autogalaxy under scripts/jax_likelihood_functions/imaging/. Restores the adapt variant of rectangular.py (previously a RectangularUniform + Constant placeholder while the library bug was open) and adds three new scripts ported from the autolens equivalents: rectangular_mge.py, delaunay.py, delaunay_mge.py. Re-enables the first three in smoke_tests.txt; delaunay_mge.py is committed but left commented in the smoke list to mirror the autolens deferral for the JAX 0.7 regression.

rectangular_mge.py is the multi-galaxy regression case the path-tuple library fix was made for. Pre-fix, the autolens single-pixelized-galaxy fallback would silently return the wrong adapt image whenever multiple pixelizations are present in the same fit; this script catches that.

Scripts Changed

• scripts/jax_likelihood_functions/imaging/rectangular.py — restored adapt variant: RectangularAdaptImage + Adapt regularization, single galaxy. Replaces the placeholder.
• scripts/jax_likelihood_functions/imaging/rectangular_mge.py — new. Two galaxies: MGE bulge + RectangularAdaptImage + Constant. Multi-pixelization regression test.
• scripts/jax_likelihood_functions/imaging/delaunay.py — new. Single galaxy with Delaunay mesh + AdaptSplit regularization + Hilbert image-mesh. Exercises the image_plane_mesh_grid_for_galaxy lookup helper.
• scripts/jax_likelihood_functions/imaging/delaunay_mge.py — new. Two galaxies: MGE bulge + Delaunay + MaternAdaptKernel + Hilbert. Committed but commented in smoke_tests.txt to mirror autolens deferral. Local run passes — re-enable when autolens does.
• smoke_tests.txt — re-enables rectangular_mge.py, delaunay.py; commented entry for delaunay_mge.py matching the autolens jax-0.7 note.

Upstream PR

• PyAutoGalaxy: fix: AdaptImages galaxy-identity mismatch across jax.jit boundary PyAutoGalaxy#370 (primary library fix)
• PyAutoLens: fix: drop AdaptImages single-pixelated-galaxy fallback in lens.to_inversion PyAutoLens#474 (cleanup of equivalent fallback)

This workspace PR is library-blocked — its CI installs autogalaxy from main, which won't have the new AdaptImages.image_for_galaxy helper until #370 is merged.

Test Plan

• Smoke tests pass for all three re-enabled scripts (rectangular.py, rectangular_mge.py, delaunay.py).
• After PyAutoGalaxy #370 merges, GitHub Actions CI for this PR is green.
• Manual local verification: source activate.sh && python scripts/jax_likelihood_functions/imaging/delaunay_mge.py passes locally even though it's commented in the smoke list (sanity check that the script itself is correct, not the JAX 0.7 environment).

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