v1.8.0
v1.8.0 — the instruction runtime: forms, delivery, signing Conformant reference runtime for the Instruction Specification (§3–§7): all §4 forms, the byte-exact §3.5 delivery pipeline, §7 signing (default-off sign feature, no new dependency), instruction_sources + the §7.7 freshness watch. Verified against the spec's samples and delivered text by the specification maintainer.