v0.6.2 — dark cluster background + GraXpert hang guard
Two fixes found during the 0.6.1 regression sweep (both pre-date 0.6.1).
Fixed
dso-star-clusterwashed-out background on light-polluted stacks. For DSLR /--stackedinput the cluster finish now stretches to an explicit dark background target (bareautostretchwashed a light-polluted stack's skyglow to grey). Scoped to that input only — Seestar FITS cluster output is byte-identical to 0.6.1. Tune underpipeline.cluster_finish.- GraXpert could hang the pipeline.
run_graxpertnow caps the GraXpert subprocess with a timeout (default 1200s); a stalled GraXpert (e.g. OOM on a very large DSLR image) fails the stage cleanly instead of blocking forever.
263 unit tests pass. Full details in CHANGELOG.
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