Add the Notarius subprocess adapter

docs/internal/adapters.md

@@ -16,6 +16,7 @@ Primary adapters:
 - `seriatim.Runner`
 - `audita.Runner`
 - `scriptorium.Runner`
+- `notarius.Runner`
 - `storage.ObjectStore`
 - `notify.Sender`
 
@@ -43,6 +44,9 @@ Adapters do not own:
 - Noop notifier (`notify.NoopSender`).
 - Object store only when required by selected stages/config.
 
+The Notarius subprocess adapter is implemented independently of stage policy;
+application composition and extract-stage wiring are not yet implemented.
+
 Object-store construction goes through `newCommandObjectStore`, which loads
 configured filesystem secrets before adapter initialization.
 
@@ -56,16 +60,18 @@ configured filesystem secrets before adapter initialization.
 
 - Composition: `internal/app/runner.go`, `internal/app/object_store.go`
 - Shared subprocess mechanics: `internal/adapters/subprocess`
-- Focused adapters: `internal/adapters/{whisperx,seriatim,audita,scriptorium,storage,notify}`
+- Focused adapters: `internal/adapters/{whisperx,seriatim,audita,scriptorium,notarius,storage,notify}`
 - `internal/adapters/whisperx/http_test.go`
 - `internal/adapters/seriatim/subprocess_test.go`
 - `internal/adapters/audita/subprocess_test.go`
 - `internal/adapters/scriptorium/subprocess_test.go`
+- `internal/adapters/notarius/subprocess_test.go`
 - `internal/adapters/storage/*_test.go`
 - `internal/app/runner_test.go`
 
 See the [WhisperX](../integrations/whisperx.md),
 [Seriatim](../integrations/seriatim.md), [Audita](../integrations/audita.md),
-and [Scriptorium](../integrations/scriptorium.md) contracts before changing an
+[Scriptorium](../integrations/scriptorium.md), and
+[Notarius](../integrations/notarius.md) contracts before changing an
 externally visible boundary. Operator-selected values belong in
 [Configuration](../config.md).