9c7f60b269
The cycle's design principle enters the ledger: every closed-vocabulary entry the binary exposes carries a one-line meaning behind one shared deterministic shape gate (doc_gate) at three seams -- compile/unit for engine-shipped entries, load for native node crates, register for the content-addressed store (documents: an additive-optional gated description). Forbids the engine evaluating description text (C17 / invariant 10), any influence on execution/identity/determinism (C1), retroactive invalidation of registered artifacts, and machine-invented meaning lines. Why: the audience is headless LLM agents (#319); field evidence #314 showed schema knowledge being recovered by CAS forensics from the release binary -- the removed failure class. All spec acceptance criteria are now met across the four iterations of this cycle (core carrier + std texts; domain threading; load seam; register seam + op-script doc slot + document description). closes #316