ADR-017: contract versioning — core crate's semver is the contract version (OQ-10 resolved)

docs/architecture/decisions/009-scheduler-collapse.md

@@ -221,7 +221,12 @@ respawning; distinct from clean stop, §1).
   **post-v1 contract extensions** — the first exercises of the
   extension path [ADR-008](008-contract-v1-pinning.md) leaves open;
   their versioning discipline (how engine crates track the additions)
-  is OQ-10's, still open.
+  is OQ-10's, still open. *(Resolved 2026-10-06 by
+  [ADR-017](017-contract-versioning.md): nothing was released when
+  these extensions were made, so they factually fall in ADR-017
+  class 1 — pre-implementation amend-in-place — and ship inside the
+  initial contract v1 text; the post-release extension *shape* this
+  ADR exercised is ADR-017's class 2.)*
 
 ## References