Brummel
03f2dc4c51
Sibling of #40 (composite output as a named multi-field record). Brings the other two composite-boundary edge-kinds to the same named-projection shape: input roles (Vec<Role { name, targets }>, rendered [in:<name>]) and a param-alias overlay (Vec<ParamAlias { name, node, slot }>) that relabels an interior leaf param slot's surface name in param_space(). Load-bearing decision recorded in the spec: param aliasing is a pure naming overlay, NOT curation — every interior slot stays in param_space() and sweepable; the alias only relabels in place, never reorders/hides (forced by the issue's "legibility not capability" framing + C23). The injected point vector is unchanged; MACD surfaces macd.fast/slow/signal instead of three indistinguishable macd.length. Gates green: feature-acceptance (worked MACD before->after is the evidence), placeholder scan clean, parse-every-block no-op (profile declares no spec_validation), grounding-check PASS (7 load-bearing assumptions each ratified by a named currently-green test; compiled_view + param_space slot-order goldens stand as the C23 regression anchors). refs #41