Behaviour-preserving threading: wrap_r's hard-wired
source_role("price") weld is gone — root roles now come from a
ResolvedBinding, one per entry in canonical column order, each fed into
the signal's same-named port; the guaranteed close entry always feeds
broker + executor (whose 'price' is a node-schema port name, not a
role). Every existing blueprint resolves to the identical single-price
plan, so the entire suite is the gate: green unchanged.
Threaded through all callers: run_signal_r, run_blueprint_member (+ its
production and test callers), blueprint_axis_probe (lenient probe
binding), reproduce_family_in, the sweep/oos/walkforward/mc family
builders, CliMemberRunner::run_member, persist_campaign_traces.
Vocabulary role names use their static form at the port seam; only an
override-renamed role leaks its name once per graph build (post-review
polish capping the per-member leak).
Verified: full workspace suite green unchanged, clippy -D warnings
clean.
refs #231
Brummel
99a7f6603c