Manual metadata generation is a non-empty agents.metadataGeneration.providers
list, but the resolver always appended the built-in defaults and the current
agent selection after it. When a manual model failed, the prompt was retried
on providers the user never chose. Manual now resolves to exactly the
configured list; Automatic is unchanged.
Commit message and PR text generation swallowed failures without logging, so
a broken manual model was invisible. The git metadata generator now logs the
final failure with each attempt's provider, model and error, and the
structured generation loop receives the session logger for per-attempt
warnings, matching the branch name path.