Document main-relative companion loading

docs/roadmap/implementation.md

@@ -227,6 +227,8 @@ incidental call counts.
 
 ## Stage 8 — Document and verify the completed sprint
 
+**Status:** Complete. Focused integration and consumer checks, the everyday checker, the race suite, and changed local-link checks passed.
+
 Update the public declaration comments and the discovery, layered loading,
 imports, resource context and selected overlay sections of
 [the configuration contract](../config.md). Document lookup versus

docs/roadmap/main-relative-inputs.md

@@ -1,6 +1,6 @@
 # Main-relative companion imports and overlays
 
-Status: design settled; not implemented. The [implementation plan](implementation.md)
+Status: implemented. The [implementation plan](implementation.md)
 owns the concrete API spelling, execution order, and verification. Baseline: `191015e`.
 
 ## Purpose
@@ -19,7 +19,7 @@ Reuse existing optional-file, directory, recursion, pattern, destination, and
 composition behavior. A new file constructor alone would not cover this workflow,
 and a second fragment-discovery implementation is unnecessary.
 
-## Current baseline
+## Prior baseline
 
 The [discovery contract](../config.md#configuration-discovery) resolves
 `SearchConfig` inside loading to one host file or absent input. Selected-file