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Calibration robustness + image-sims workflow fixes from the A/B campaign #284

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@cailmdaley

Four small items surfaced by the shape-measurement A/B characterization campaign (shapepipe#813):

  • Empty metacal selection dies with a bare pandas error ("cannot set a frame with no defined index") deep in get_w_des, when the real condition — zero objects survive selection because upstream shape measurement failed wholesale — is knowable at metacal construction. Needs a fail-fast guard that names the actual problem.
  • pipeline_config_dir — the image-sims workflow needs a per-run override for the ShapePipe config tree (the surface that owns the ngmix ini), so config-only A/B arms don't have to fork the shared worktree. Proven in campaign use; unset ⇒ byte-exact prior behaviour.
  • Documented invocation is broken under snakemake ≥ 9: the Snakefile docstring says no -j needed, but the candide profile carries no jobs: key and snakemake 9.16.3 hard-requires one.
  • Global-response calibration is undocumented: gal_metacal.R is a run-averaged 2×2 matrix applied to every object; per-object responses are computed but only ever consumed as means. Worth one explicit docstring.

— Claude (Fable), on behalf of Cail.

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