Prepare the v2.2.1 release

docs/releases/v2.2.1.md

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+# Narratio v2.2.1
+
+This maintenance release consolidates checkpoint persistence for transcription
+and analysis without changing their operator-facing behavior.
+
+## Summary
+
+Transcribe and analyze now share one internal operation for preparing isolated
+checkpoint candidates, saving them, and promoting successfully saved progress
+into live state. Each stage retains its own progress model and recovery policy.
+
+## Compatibility
+
+CLI commands, configuration, manifest schemas, artifact formats, and external
+integration contracts are unchanged. Speaker concurrency, artifact selection,
+force behavior, and ordinary resume semantics are preserved. No dependency
+upgrade or new external-tool version requirement is introduced.
+
+## Upgrade
+
+No special upgrade action or configuration migration is required when upgrading
+from v2.2.0. See the [v2.2.0 release notes](v2.2.0.md) when upgrading from an
+earlier version for the original speaker-checkpoint upgrade considerations.
+
+## Changes
+
+- Replace duplicate analyze/transcribe save-and-promote sequences with a
+  shared, private checkpoint helper.
+- Isolate checkpoint collections from live state, including analyze records
+  normalized during a transcription checkpoint save.
+- Preserve transcription's caller-owned locking and failure handling, and
+  analysis's working/committed collections and rollback behavior.
+- Add focused checkpoint integrity tests while retaining stage and application
+  recovery coverage.
+- Document the shared [checkpoint persistence boundary](../internal/manifest.md#checkpoint-persistence-boundary).