Document the bundled OpenRouter configuration

docs/roadmap/bundled-openrouter.md

@@ -2,7 +2,8 @@
 
 ## Status And Purpose
 
-Design decisions settled; implementation has not started.
+Implemented: engine construction installs the embedded OpenRouter underlay by
+default, with an option to disable it and ordinary caller composition.
 
 Ship a small OpenRouter configuration bundle with PromptKit so consumers
 can begin using named profiles without installing a separate catalog. Include
@@ -14,10 +15,10 @@ the need for PromptKit releases just to refresh individual model versions.
 This is a convenience catalog, not an exhaustive model inventory or a promise
 of stable upstream model behavior.
 
-## Current Baseline
+## Historical Baseline
 
 PromptKit depends on ConfigKit v1.1.0 and records field normalization and derived
-defaults during resolution. It currently installs no backend or profile
+defaults during resolution. At that baseline it installed no backend or profile
 definitions. Consumers supply configuration inputs, which ConfigKit composes
 before PromptKit validates and materializes effective resources.
 

docs/roadmap/implementation.md

@@ -298,3 +298,7 @@ Completion requires default availability, full disabling, ordinary caller
 composition and provenance, correct cost-tier payloads and explicit diagnostic
 fallbacks, and current documentation. There are no unresolved product choices,
 external publication prerequisites, or new recurring release gates.
+
+Completion: public guidance, GoDoc, offline examples, and the unreleased v0.18.0
+note describe the bundle and opt-out. The race-enabled suite, vet, three example
+commands, and diff checks passed on Go 1.27.0; no release was published.