iter ctt.1: env-overlay shape ratification + DuplicateCtor pin

docs/roadmap.md

@@ -76,11 +76,11 @@ context. Pick the next milestone from P1.)_
   to make sure the indirection doesn't tank latency.
   - context: JOURNAL 2026-05-09
   - depends on: Post-22 Prelude — Eq/Ord (shipped 23.5)
-- [ ] **\[todo\]** `types` / `ctor_index` overlay shape question —
+- [x] **\[todo\]** `types` / `ctor_index` overlay shape question —
   decide whether the env's two parallel ctor maps should collapse
   into one overlay, or stay split. Surfaced during the
   env-construction unify audit.
-  - context: JOURNAL 2026-05-10 ("Audit close: env-construction unify")
+  - context: JOURNAL 2026-05-10 ("Audit close: env-construction unify"); closed by iter ctt.1 — DESIGN.md §"Env construction" anchors the split decision.
 - [ ] **\[todo\]** CLI human-mode diagnostic surface for `WorkspaceLoadError` —
   non-JSON `ail check` routes ct.1 errors via `anyhow`/`thiserror`
   Display (`Error: <message>`) instead of going through
@@ -180,7 +180,7 @@ context. Pick the next milestone from P1.)_
   - context: fieldtest 2026-05-11 — fieldtest fixtures could not be
     placed under `examples/fieldtest/` because of this; predates the
     canonical-type-names milestone but surfaces every time.
-- [ ] **\[todo\]** `check_in_workspace` per-module overlay narrowing —
+- [x] **\[todo\]** `check_in_workspace` per-module overlay narrowing —
   `crates/ailang-check/src/lib.rs:1234` still clears+rebuilds
   `env.ctor_index` per-module; ct.3.2 narrowed the analogous mono
   overlay to types-only. The typecheck-side overlay's `env.ctor_index`
@@ -189,7 +189,7 @@ context. Pick the next milestone from P1.)_
   Narrowing is mechanical but needs a careful read to confirm no
   other consumer survives.
   - context: JOURNAL 2026-05-11 ("Iteration ct.4") — milestone close
-    follow-up.
+    follow-up; closed by iter ctt.1 — recon confirmed the rebuild is the load-bearing consumer of in-band DuplicateCtor (pinned by `crates/ailang-check/tests/duplicate_ctor_pin.rs`); the asymmetry with the mono side is intentional.
 
 ## P3 — Ideas