Complete runner lifecycle refactor

docs/internal/adapters.md

@@ -35,8 +35,9 @@ Adapters do not own:
 
 ## Default Wiring
 
-`internal/app/runner.go` initializes default adapters when not injected and
-only when the selected execution plan needs them:
+The application composes default adapters per invocation when they were not
+injected through the stage environment, and only when the selected execution
+plan needs them:
 
 - WhisperX HTTP client for `transcribe`.
 - Seriatim subprocess runner for `merge`, `normalize`, `trim`, or `render`.
@@ -49,8 +50,10 @@ only when the selected execution plan needs them:
 Remote publish locks are loaded only for a selected, enabled publish that
 uploads a run. Shared session lifecycle setup still applies to every selected
 range, but an unselected integration is neither initialized nor validated by
-runner composition. Each selected stage retains its own fail-fast configuration
-and input validation.
+application-owned composition. Constructor, clock, randomness, remote-lock,
+and post-publish deletion boundaries are scoped to the invocation; stages still
+receive their collaborators through the stage environment. Each selected stage
+retains its own fail-fast configuration and input validation.
 
 `session plan` is outside production adapter composition. It performs
 resume validation and models selected transitions against cloned manifest
@@ -88,7 +91,8 @@ configured filesystem secrets before adapter initialization.
 
 ## Implementation And Tests
 
-- Composition: `internal/app/runner.go`, `internal/app/object_store.go`
+- Composition: `internal/app/runner_composition.go`,
+  `internal/app/runner_dependencies.go`, `internal/app/object_store.go`
 - Shared subprocess mechanics: `internal/adapters/subprocess`
 - Focused adapters: `internal/adapters/{whisperx,seriatim,audita,scriptorium,notarius,storage,notify}`
 - `internal/adapters/whisperx/http_test.go`