Task 3-4 of the bound-override cycle. The family boundary derives the
override set from the invocation's axes (override_paths: an axis in the
open space passes through, one naming a bound param re-opens it in
strategy coordinates, one matching neither is refused with a message
pointing at --list-axes) and threads it through the axis probe and every
per-member reload (blueprint_axis_probe_reopened / reopen_all), so probe
and members stay slot-identical. The 'fully bound; nothing to sweep'
refusal retires; identity stays the authored document (the topology_hash
probe reload is never re-opened).
--list-axes now prints the bound surface after the open knobs — one
'<bp>.<node>.<param>:<KIND> default=<value>' line per bound param,
unconditionally (a bound param is an equally re-openable axis regardless
of how many knobs are open beside it).
Walk-forward (blueprint_sweep_over, blueprint_walkforward_family,
run_oos_blueprint) and reproduce (reproduce_family_in plus the
campaign-side trace re-run) derive the same set silently from recorded
manifest param names (bound_overrides_of), so a family that swept an
overridden bound param re-derives bit-identically.
refs #246
claude
3f4c9478bf