Complete input destination implementation audit

docs/roadmap/input-destinations.md

@@ -1,10 +1,10 @@
 # Configuration Input Destinations Roadmap
 
-Status: design decisions approved; implementation has not started. This roadmap
-responds to the [PromptKit feature request](promptkit-feature-request.md) and owns
-the target state and selected design decisions. The
-[implementation plan](implementation.md) owns sequencing, implementation details,
-and completion evidence.
+Status: implemented. This roadmap records the approved behavior and rationale
+for the [PromptKit feature request](promptkit-feature-request.md). The
+[implementation plan](implementation.md) records the completed sequence and
+audit evidence; the [configuration contract](../config.md#input-destinations)
+owns current behavior.
 
 ## Targeted end state
 
@@ -88,9 +88,9 @@ namespace ownership enforcement, dependency solving, live reload, filename-based
 identity, arbitrary transformations, or new merge strategies. PromptKit owns its
 collection inventory, qualified IDs, and execution semantics.
 
-## Current baseline
+## Implementation baseline (v0.7.1)
 
-The request reviewed v0.7.1. The current worktree has these relevant boundaries:
+The request reviewed v0.7.1. At that baseline, the relevant boundaries were:
 
 - [Input](../../layered.go) holds a source, import opt-in, and filesystem context,
   but no destination. Root types delegate to the engine through the existing