spec: embedding-abi-m2 — per-thread runtime context + concurrency safety (user-approved, grounding-check PASS 9/9); open in-flight [~]

docs/roadmap.md

@@ -218,7 +218,7 @@ work progresses.
     finding [spec_gap]#2;
     `docs/journals/2026-05-18-iter-emit-ir-staticlib.md`.
 
-- [ ] **\[milestone\]** Embedding ABI — M2: per-thread runtime
+- [~] **\[milestone\]** Embedding ABI — M2: per-thread runtime
   context + concurrency safety. `ailang_ctx_new()/_free` threaded
   through every call; neutralise the two process-global hazards
   the runtime read surfaced — the non-atomic
@@ -236,6 +236,14 @@ work progresses.
   - depends on: Embedding ABI — M1.
   - context: 2026-05-18 chat; runtime hazard read
     (`runtime/rc.c` global stats + `atexit`).
+    Spec'd + user-approved 2026-05-18 (grounding-check PASS 9/9):
+    `docs/specs/2026-05-18-embedding-abi-m2.md` — ctx as mandatory
+    explicit C-ABI param (TLS-forwarder, internal conv + `_adapter`/
+    `_clos` byte-untouched); ctx near-empty by discipline
+    (`{alloc,free}_count` only); hazards neutralised in the swarm
+    artefact, `g_rc_*`+atexit retained as the null-ctx executable
+    fallback; staticlib RC-only enforced; no schema/surface change.
+    Plan next.
 
 - [ ] **\[milestone\]** Embedding ABI — M3: frozen value layout +
   single ADT/record crossing + RC ownership contract. Host