Builder: NodeHandle::param -> ParamRef, GraphBuilder::gang, build() resolves
the gang table (collect-then-reject, BuildError::{UnknownParam,AmbiguousParam,
BadGang}) and terminates in Composite::with_gangs — the same predicate the
op-script and serde boundaries use. C24 lockstep extended: an op-script gang
replay serializes byte-identically to the GraphBuilder twin (FlatGraph edges +
sources + canonical JSON).
Render: model_to_json emits a per-scope gangs fragment (name, kind, [node,pos,
"param"] members) for ganged scopes only — the gang-free model stays
byte-identical (model_golden untouched). graph-viewer.js annotates a ganged
open param with its public knob name; guarded by a viewer_gang_param.{mjs,rs}
pair RED-first per the established viewer_bound_param convention (a welcome
extra beyond the plan's file list).
Ratified deviation: the model's kind string uses the serde form ("I64") — the
plan's implementation snippet (kind_str -> "i64") contradicted its own test;
resolved toward the test + the blueprint_serde form. Two quality nits held as
principled plan-holds (inline resolution block; the unreachable unwrap_or
placeholder check_gangs refuses first).
Verified: aura-engine lib 264/0 (model_golden, lockstep, builder, carrier all
green), viewer_gang_param 1/0, workspace clippy -D warnings clean. Slice
resumed across a transient API failure via workflow resume (cached prefix).
refs #61
Brummel
bc88e18247