Record ordinary import scheduling completion

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Implementation Plan: Import Discovery and Dependency-Ready Ordering
 
-Status: Stages 1–4 complete; 15 implementation stages remain.
+Status: Stages 1–5 complete; 14 implementation stages remain.
 
 ## Authority, baseline, and execution
 
@@ -315,6 +315,16 @@ Acceptance: ordinary import values, registered sequence order, conflict sites,
 main-version protection, source records, and authored resource contexts agree.
 Document this implemented ordering boundary in the import contract.
 
+Completion: implemented in commit `5ed0f55` (`Schedule ordinary import
+contributions by dependency`). Verified with `go test ./internal/engine
+-count=1`, `go test . -run
+'^TestFacadeSourceVersionEvidenceFollowsAssembledSequenceRanges$' -count=1`,
+`./scripts/check.sh`, and `git diff --check`. Acquisition records and version
+callbacks remain in traversal order; ordinary contributions use the shared
+dependency-ready schedule, with main-source ownership and projected evidence
+following the scheduled contributions. Item-scope ordering remains for later
+work.
+
 ## Stage 6 — Assemble item-local scopes under the scheduler
 
 Integrate item nodes and local schedules for imported and selected main items.