finding(AFD-023): loom dead-stores miscompiles the meld-fused core — SIL gate caught it (loom#220)

[avrabe]

Release-watch loop iteration #20 (2026-06-14). New: falcon v1.59.0, synth v0.11.45, spar v0.18.0.

The catch (behavioral SIL gate, on the meld→loom reorder)

Moving to meld → loom → synth makes loom optimize the fused core — and the §3a behavioral gate caught loom's dead-stores pass producing valid-but-wrong output on the fused falcon-v1.59 core: run-stabilization 0.023399856 → 0.32916 (kiln, same runtime). Pass-bisected: only dead-stores is wrong; the other 15 passes are correct. Filed loom#220 with a byte-exact committed repro (repro/loom-dead-stores/).

• BUILD.bazel now runs wasm_optimize with all passes except dead-stores (SIL-verified correct) — keeps the meld→loom→synth order safe until loom#220 lands. AFD-023.

Per-piece (new releases)

Piece	Result
falcon v1.59.0 wasm	asset present (relay#140 holds); SIL gate 0.0234 / 0.1317 ✅
meld v0.31.0 fuse	valid ✅
kiln v0.3.2 fused-core stab	== reference ✅
spar v0.18.0 WIT codegen	valid ✅
synth v0.11.45	installed (burndown deferred — clean fixture needed post-loom-fix)

Supervision

• rwc#505 (my wasm_component_import) MERGED — jess can drop its local adopt shim (follow-up: bump rwc pin past the merge).
• gale#63 (msgq now dissolves via synth v0.11.45 → joins sem/pipe/mutex for the WIT world), relay#177 (ownership resolved: relay owns seam, gale owns ring) — progressing.

rivet validate: PASS.

🤖 Generated with Claude Code