First slice of declared taps: a Tap { name, from: TapWire { node, field } }
is the output-side twin of input_roles — a pure data declaration naming an
interior output wire, no sink endpoint. Composite gains a taps field
(with_taps/taps(), additive) and the serde mirror CompositeData carries it
(Tier-1 additive: no format-version bump, absent-taps documents byte-stable).
Tap/TapWire are re-exported from the crate root beside Role/OutField so
downstream crates can author tap-bearing blueprints.
refs #282
claude
7239106f4e