reproduce_family returns Result<ReproduceReport, RunnerError> — divergence
is a result the embedding caller reads (all_identical()), never an error;
the CLI renders the per-member lines and summary byte-identically and owns
the exit (1 on divergence, no stderr line). The library's print block and
the empty-message refusal are gone; exit_on_runner_error always prints
(no empty producer remains).
reproduce_family_in gains the identity/pip guard, firing before any store
fetch: an instrument mismatch (incl. synthetic-for-real) and a broker/pip
mismatch — forward-built label compare against the stored broker string
(RunManifest carries no pip field; the mint's label constructors became
shared pub(crate) helpers, so guard and stamp cannot drift). The class is
context-borne: the explicit-source seam refuses 2 (caller-named source),
the derived simple path refuses 1 (data drift), same prose. A window
guard is deliberately absent — no reproduce path takes a caller window.
In-process tests pin the promise: divergence returns Ok, drift refuses
class 1, the host survives. Fork minutes: issues/299#issuecomment-4875,
-4877, -4879.
closes#299
claude
58d5345a75