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HowToLens cluster tutorial: show a pixelized source + fix the

Type: docs Target: HowToLens Repos:

  • PyAutoLens
  • autolens_workspace
  • howtolens Difficulty: large Autonomy: supervised Priority: normal Status: formalised Epic: cluster-strong-lensing Phase: 12 Parent: draft/feature/autolens/source_cluster_arc.md Filed: 2026-08-19 (backfilled from git)

HowToLens cluster tutorial: show a pixelized source + fix the stale cross-reference

Part of the Source & Cluster arc (phase 12 of 12), gated on phase 10. User request (verbatim): "HowToLens Cluster should show pixelized source."

Audit: HowToLens/scripts/chapter_4_scaling_up_lensing/tutorial_5_cluster_scale.py is point-source only, and its lines 181-184 claim extended-source cluster modeling "does exist in PyAutoLens as a specialised follow-up analysis — see the autolens_workspace cluster examples" — that cross-reference is stale today (no such example exists until phase 10 lands). If any HowToLens release ships before phase 10, fix the stale claim first as a one-line docs patch.

Work (after phase 10): extend tutorial 5 (or add a follow-up section) showing the per-source-masked pixelized reconstruction of one cluster arc, teaching the regime-ladder point — clusters default to point-source constraints, extended reconstruction is the specialised follow-up — and forward-reference the cluster source_science.py magnification story (phase 9). Tutorial prose is Opus-tier work per the model-split convention.