The merge of main added resolvePrBaseRef (consumes tryRun mocks before the
push sequence) and classifyGhError mapping (network errors -> structured
502 with githubError payload). The long-orphaned test pinned the old shape.
Re-mapped mock queues to the real sequence, asserted the stronger current
error contract (status + githubError.code + retryable), and made the
accidentally-passing no-commits test deterministic. Mutate-to-prove
verified the push assertion still bites.
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