fix: drop AdaptImages single-pixelated-galaxy fallback in lens.to_inversion

[Jammy2211]

Summary

Replaces the fragile single-pixelated-galaxy fallback in autolens/lens/to_inversion.py with the new AdaptImages.image_for_galaxy helper from PyAutoGalaxy. The fallback (lines 280-290) was a workaround for the same jax.jit-unflatten Galaxy-identity issue: when a fit had exactly one pixelization, it picked the only entry in galaxy_image_dict by has(cls=Pixelization). That covers the common single-source case but is incorrect once a fit has multiple pixelizations.

The new helper looks up adapt images by path-tuple via tracer.galaxies ordering, which is stable across the JIT boundary. Per-plane GalaxiesToInversion constructions in image_plane_mesh_grid_pg_list now pass path_galaxies=self.tracer.galaxies so the autogalaxy-side helper sees the full list (the per-plane subset would otherwise misalign with galaxy_path_list).

Depends on PyAutoLabs/PyAutoGalaxy#370, which introduces image_for_galaxy and the path_galaxies constructor argument on GalaxiesToInversion. Merge order: PyAutoGalaxy first.

API Changes

Analysis.fit_from (imaging + interferometer) passes galaxies=tracer.galaxies into adapt_images_via_instance_from. No public symbols added or removed in autolens. Internal change. See full details below.

Test Plan

• Existing test_autolens/ suite remains green (256 pass locally).
• After PyAutoGalaxy PR lands and merges, run the autolens_workspace_test smoke tests for jax_likelihood_functions/imaging/{rectangular,rectangular_mge,delaunay,delaunay_mge}.py to confirm the fallback removal doesn't regress single-pixelization fits.

Full API Changes (for automation & release notes)

Removed

• Single-pixelated-galaxy fallback at autolens/lens/to_inversion.py:280-290. The pattern (search dict keys for has(cls=Pixelization) and grab [0] when len(galaxies_with_pixelization_list) == 1) is replaced by the path-tuple lookup in AdaptImages.image_for_galaxy.

Changed Behaviour

• TracerToInversion.adapt_galaxy_image_pg_list resolves adapt images via image_for_galaxy(galaxy, self.tracer.galaxies) for all pixelization counts, not only the single-pixelization case.
• TracerToInversion.image_plane_mesh_grid_pg_list constructs per-plane GalaxiesToInversion instances with path_galaxies=self.tracer.galaxies so the autogalaxy helper's positional lookup aligns with the full galaxy list rather than the per-plane subset.

Migration

• Internal — no migration needed. Public Analysis.fit_from signatures unchanged.

🤖 Generated with Claude Code

[Jammy2211]

Workspace PR: PyAutoLabs/autogalaxy_workspace_test#12