fix: reload results guide dataset noise map

[Jammy2211]

Overview

The fresh PyAutoBuild release-prep run 2026-06-09T18-03-42Z shows autogalaxy_workspace/scripts/guides/results/start_here.py failing in the simple-loading section. The script attempts to load image/dataset.fits from a completed fit, but strict Imaging.from_fits(...) validation rejects the saved noise-map HDU because it contains zero values.

The report correlates this failure with the recent results-guide dataset reload change, so this should be treated as a narrowly scoped workspace release fix.

Plan

• Inspect the saved-results reload section in scripts/guides/results/start_here.py.
• Update only the FITS reload path so the guide can inspect saved output artifacts without applying strict input-dataset noise-map validation.
• Keep the main modeling dataset load unchanged.
• Rerun scripts/guides/results/start_here.py in a clean task worktree.
• Ship a pending-release workspace PR if the target script passes.

Detailed implementation plan

Affected Repositories

• autogalaxy_workspace (primary)

Work Classification

Workspace

Branch Survey

Repository	Current Branch	Dirty?
./autogalaxy_workspace	main	dirty from local full-run regenerated datasets
./PyAutoPrompt	main	dirty from unrelated deleted prompt files plus this new prompt

Suggested branch: feature/autogalaxy-results-start-here-noise-map
Worktree root: ~/Code/PyAutoLabs-wt/autogalaxy-results-start-here-noise-map/

Implementation Steps

1. Work only in the task worktree, not the dirty canonical checkout.
2. In scripts/guides/results/start_here.py, inspect the block loading image/dataset.fits with data_hdu=1, noise_map_hdu=2, and psf_hdu=3.
3. Apply the smallest supported API change for loading saved result FITS whose noise-map HDU may be zero-valued.
4. Rerun scripts/guides/results/start_here.py with the PyAutoBuild environment variables used by the release runner.
5. Ship via workspace PR with pending-release.

Key Files

• scripts/guides/results/start_here.py — failing saved-results reload block.

Original Prompt

Click to expand starting prompt

continue

[Jammy2211]

Closed as already resolved by merged PR #112 (merge commit de9a355). I verified the current origin/main reloads the saved result dataset with check_noise_map=False, so the old release report failure was from a checkout that was behind origin/main.