Wave 2 de-risking: execution-measured per-module emit-frontier probe over the 27 src/v2/compiler modules — fixture-FREE self-emit bar (emit→compile→run→equivalent, no injected fixtures, discriminating RED) — + answer common-root vs 24-heterogeneous-gaps + Wave-2 sizing

src/v1/stage0/Cargo.toml

@@ -67,6 +67,17 @@ path = "src/bin/discover_owned_data.rs"
 name = "discover_source_root_ingest"
 path = "src/bin/discover_source_root_ingest.rs"
 
+# SCAFFOLD (DESIGN §7 seed-retained HAND-RUST / P5) — per-module emit-frontier survey host transport.
+# Authority: module census reads `compiler_frontier_sweep_order` from `frontier.dag` at runtime (no parallel roster).
+# NOT floor-enrolled — long-lane local recipe via `frontier_probe_survey_transport.dag`.
+# DISSOLUTION: shrink when `^migrate_when_frontier_per_module_probe_receipt_binds` lands (gunbc.plans.wave2_prep_design
+# §census carrier) and survey receipts replace knowledge-attributed roster rows; then delete this bin and fold the
+# per-module loop into a pure `.dag` witness or self-emitted transport (same dissolution row as
+# `frontier_probe_survey_transport_scaffold_note`).
+[[bin]]
+name = "frontier_probe_survey"
+path = "src/bin/frontier_probe_survey.rs"
+
 # Whole-tree v2 parse regression scanner (host transport; one harness, N files).
 [[bin]]
 name = "v2_whole_tree_parse_scan"