Close analyze checkpointing workstream

docs/troubleshooting.md

@@ -428,6 +428,34 @@ narratio analyze 2026-04-04 --artifacts session_recap
 Relevant references: [Operations: Artifact Selection](./operations.md#artifact-selection)
 and [Artifact Internals](./internal/artifacts.md#resolution-rules).
 
+## Analysis manifest checkpoint failed
+
+Symptom:
+
+- analyze reports that it could not save the session manifest after completing
+  an artifact.
+
+Likely causes:
+
+- the workspace is unwritable or out of space;
+- the manifest path or its parent directory has unsafe permissions or type; or
+- a transient local filesystem error interrupted atomic manifest replacement.
+
+Safe fix:
+
+- correct the reported filesystem or permission problem;
+- inspect `session artifacts` to identify the last durable current records; and
+- rerun analyze normally. Narratio reuses earlier successful checkpoints and
+  retries the failed or non-current artifact and its required dependents.
+
+Do not treat a newly created canonical artifact file as current when its
+checkpoint failed, and do not edit the manifest to advertise it. If the error
+recurs, preserve the manifest and run-local diagnostics before repairing the
+workspace.
+
+Relevant references: [Operations: Stage Execution and Continuation Behavior](./operations.md#stage-execution-and-continuation-behavior)
+and [Manifest Internals](./internal/manifest.md#persistence-semantics).
+
 ## Built-in transcript or bounds source is unavailable
 
 Symptom: