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Source & Cluster arc — magnification science, PointSolver trust, cluster extended sources

Type: feature Target: PyAutoLens Repos:

  • PyAutoLens
  • PyAutoArray
  • PyAutoGalaxy
  • autolens_workspace
  • autolens_workspace_test
  • autolens_profiling
  • HowToLens Difficulty: too-large Autonomy: supervised Priority: high Status: draft Epic: cluster-strong-lensing Filed: 2026-08-19 (backfilled from git)

Parent tracker for a 12-phase arc (2026-08-19 intake; deep-research grounded). This file is never routed to start_dev directly — each phase below is its own prompt, issued ONE AT A TIME as its predecessor nears shipping (no bulk issue queues).

Science anchors: LEGGOS II (arXiv:2606.20804 — point μ = map value at pixel; area μ_arc = A_img/A_src with A_src = Σ A_pix,i/μ_i, Eq. 6-7; errors from ~300 posterior draws; Fig. 4 fractional-uncertainty map with constant-μ contours; critical curve as arc-segmentation boundary), Richard+17 (HFF magnification-map deliverables), Atek+15 (magnification as source-science tool), Jullo+08 (multi-z cluster cosmography).

Phases (order is load-bearing)

  1. draft/bug/autolens/point_solver_error_bisect_health.md — bisect the error-behavior change (prime suspect: magnification-filter Hessian buffer=self.scale → hardcoded 0.01, Mar 2026) + health-harden. Blocks everything point/cluster.
  2. draft/research/autolens_profiling/point_solver_profiling_cells.md — quasar / cluster-runtime / single-source / factor-graph profiling cells. Gate: 1.
  3. draft/refactor/autogalaxy/critical_curves_dispatch_cluster.md — context-aware engine dispatch, dedupe twin plot_utils, cluster plots honor the flag. Before all map/segmentation phases.
  4. draft/test/workspaces/mesh_magnification_correctness.md — areas + magnification recovery across every mesh variant (rectangular/delaunay/delaunay_nn/knn).
  5. draft/feature/autolens/point_magnification_api.md — μ at a point, documented in source_science + point package; parity decision; multi-plane.
  6. draft/feature/autolens/area_magnification_leggos.md — LEGGOS Eq. 6-7 pixel- inversion area μ as primary; ShapeSolver rehabilitate-or-retire; wiki ingest. Gates: 3, 5.
  7. draft/feature/autolens/magnification_errors_posterior_draws.md — standalone posterior-draw errors in source_science; latent decision. Gates: 5, 6.
  8. draft/feature/autolens/magnification_maps_visualization.md — image-plane contour maps, source-plane mesh maps, Fig-4 uncertainty map, pretty pass. Gates: 3-7.
  9. draft/feature/workspaces/cluster_source_science.md — new cluster/source_science.py (point-source tier). Gates: 1, 3, 5-8.
  10. draft/feature/workspaces/cluster_pixelized_analysisfactor.md — per-source-mask pixelized refinement via AnalysisFactor; implements the extended_source plan in draft/docs/workspaces/cluster_regime_narrative.md. Gates: 4, 9.
  11. draft/research/autolens/cluster_extended_source_inference.md — JAX-gradient joint-inference feasibility verdict (go/no-go only). Gate: 10.
  12. draft/docs/howtolens/cluster_pixelized_source.md — HowToLens cluster tutorial pixelized source + fix the already-stale cross-reference (the stale-claim fix may land early if a HowToLens release precedes phase 10). Gate: 10.