Add facade lifecycle wrappers

docs/roadmap/implementation.md

@@ -382,7 +382,7 @@ lifecycle and callback wrappers to the split engine result.
 
 ## Stage 6 — Wire candidate lifecycle and callback wrappers
 
-Status: not started.
+Status: complete (2026-09-12).
 
 1. Add candidate Definition, Options, VersionRule, Version, FilesystemContext,
    Override, Resolution, and Validation with unchanged public declarations.
@@ -404,6 +404,23 @@ and detached entry provenance stays fixed. Run
 `go test ./internal/facade ./internal/engine -run 'Load|Resolution|Validation|Version|Metadata|Secret|Callback|Facade'`,
 `go test -race ./internal/facade ./internal/engine`, and the everyday check.
 
+### Completion
+
+Added the temporary facade's root-owned lifecycle declarations, option conversion,
+live callback wrappers, `Load`, `Result`, and `Metadata`. Callback wrappers carry
+only the active engine context during callback execution; `Result` stores the
+published configuration once and keeps its non-generic engine inspection private.
+All record and path crossings use explicit conversion, and facade loads translate
+engine load failures to the root-owned `LoadError` type.
+
+External candidate tests exercise public version, default, resolution, validation,
+metadata, source, and secret behavior, including inactive retained contexts and
+typed load errors. Linux validation with Go 1.26.7 passed
+`go test ./internal/facade ./internal/engine -run 'Load|Resolution|Validation|Version|Metadata|Secret|Callback|Facade'`,
+`go test -race ./internal/facade ./internal/engine`, and `./scripts/check.sh`.
+There were no deviations or remaining risks. The next handoff completes the
+candidate inspection and secrets-bootstrap surface.
+
 ## Stage 7 — Complete candidate inspection and bootstrap surface
 
 Status: not started.