Integrate extraction lifecycle and resume validation

docs/cli.md

@@ -75,7 +75,8 @@ narratio run <session_id> [--force] [--artifacts <name[,name...]>] [...common co
 Behavior:
 
 - evaluates full stage order;
-- skips already-succeeded stages unless `--force` is set;
+- skips already-succeeded stages unless `--force` is set or a stage-specific
+  resume check finds its durable result obsolete;
 - continues interrupted or partially completed sessions by running non-succeeded stages;
 - writes session and run manifests.
 
@@ -93,6 +94,7 @@ Valid stage names:
 - `polish`
 - `normalize`
 - `trim`
+- `extract`
 - `render`
 - `analyze`
 - `publish`