Reuse valid workspace checkpoints on request

docs/cli.md

@@ -21,7 +21,7 @@ ID in config or with `--llm-profile`.
 
 ```text
 notarius help
-notarius run <pipeline-id> --input path/to/source.json [--config path/to/config.yml] [--only lane-a,lane-b] [--session-id id] [--reference selector=path] [--without-reference selector]
+notarius run <pipeline-id> --input path/to/source.json [--config path/to/config.yml] [--only lane-a,lane-b] [--resume] [--session-id id] [--reference selector=path] [--without-reference selector]
 notarius config validate --config path/to/config.yml [--pipeline pipeline-id] [--only lane-a,lane-b]
 notarius pipelines list --config path/to/config.yml [--json]
 ```
@@ -41,6 +41,8 @@ Flags:
   `NOTARIUS_CONFIG`, then `/usr/local/etc/notarius/config.yml`.
 - `--only lane-a,lane-b`: run only the named artifact lanes. Values are
   comma-separated and must be non-empty.
+- `--resume`: reuse valid workspace checkpoints for this invocation. Requires
+  `workspace.resume.enabled: true`.
 - `--output-dir path`: output root. The run writes to `<path>/<run-id>/`.
   Defaults to `./notarius-output`.
 - `--diagnostics-dir path`: diagnostics work directory override for this
@@ -140,6 +142,16 @@ go run ./cmd/notarius run dnd-session \
   --session-id campaign-17-session-04
 ```
 
+Use `--resume` to reuse valid checkpoints from a previous compatible
+invocation:
+
+```sh
+go run ./cmd/notarius run dnd-session \
+  --config examples/dnd-spells.config.yml \
+  --input examples/seriatim-minimal-transcript.json \
+  --resume
+```
+
 For durable output, diagnostics, retention, and failure inspection, see
 [Operations](operations.md).