Move chunks into the canonical source model

docs/operations.md

@@ -91,6 +91,14 @@ digests match the current invocation. Changes to input bytes, the resolved
 pipeline, selected lanes, the runtime LLM profile override, or bound reference
 content invalidate reuse.
 
+Current checkpoint manifests use workspace schema `notarius.workspace.v2`.
+Manifests written with `notarius.workspace.v1` are incompatible because their
+chunk provenance has an older shape. On the first explicit resume after an
+upgrade, each affected checkpoint is treated as a reuse miss and its workflow
+step executes normally. The compatibility check does not migrate or delete the
+v1 files; when checkpoint writing is enabled, normal execution refreshes the
+affected checkpoint files in the current schema.
+
 Runs do not reuse checkpoints unless explicitly requested. Without reuse, the
 workflow executes normally and refreshes checkpoint files when checkpointing is
 enabled.