Branch E — A–F Regression After Fixes

Doc 05 (2026-05-29) — PILOT-GREEN

Targeted read-only regression after the two live commits, to prove nothing broke.

Check	Function	Result	Verdict
Reconstruct	fn_iu_reconstruct_source('…dieu39…md')	16 rows (DIEU-39, == doc_code IU count)	✅ PASS
Axis B	fn_iu_filter_axis_b('legal_domain:knowledge_systems',50)	1 summary row (iu_count=16, consistent)	✅ PASS
Axis C	fn_iu_filter_axis_c_subtree (live earlier this campaign series: 8 nodes, 0 orphan/cycle)	unchanged	✅ PASS
Compose/Split/Merge	not impacted by fixes; split 1 / merge 0 unchanged	—	✅ N/A-stable
SQL link	fn_iu_sql_link_resolve_all()	view==direct	✅ PASS
Trigger/DLQ	no wrappers added live (packs only); dlq 0	unchanged	✅ stable
Vector safety	vector_sync_enabled	false	✅ PASS
Gate	fn_iu_gate_verify_closed()	all_safe=true, never_flip_intact=true	✅ PASS

Entry vs exit counts: iu 219=219 · iu_relation 60=60 · split 1=1 · merge 0=0 · iu_sql_link 3=3 · iu_metadata_tag 536=536 · dot_iu_command_run 55=55 · iu_vector_sync_point 152=152 · idle-in-tx 0. Only intended delta: dot_iu_command_catalog 53→54 (reconstruct DOT) and fn_cut_complete redefined (behaviour-preserving, gate off).

Verdict: PILOT-GREEN — all sampled IU capabilities pass; the P0 fix and the reconstruct DOT registration introduced no regression; vector frozen; gate closed.