Finalize previous-session artifact documentation and restore-analyze continuity coverage

docs/operations.md

@@ -48,7 +48,7 @@ Restore source-of-truth:
 - remote current manifest: `current/manifest.json`
 
 Restore default scope:
-- includes `manifest.json`, `transcripts/**`, `artifacts/**`
+- includes `manifest.json`, `transcripts/**`, `artifacts/**`, `previous/**`
 - includes `audio/**` only with `--include-audio`
 - excludes `runs/**`, `logs/**`, `reports/**`, `config/**`, `inputs/**`, and `current/**` (except remote `current/manifest.json` as source)
 
@@ -67,6 +67,7 @@ Canonical session directories:
 - `audio/`
 - `transcripts/`
 - `artifacts/`
+- `previous/`
 - `reports/`
 - `logs/`
 - `config/`
@@ -99,6 +100,12 @@ Configured artifact source reuse:
 - accepted on `run`, `resume`, and `run-stage analyze`.
 - filters analyze execution only; does not force stage rerun.
 
+Canonical previous-session input behavior:
+- canonical sources use `narratio.previous_session.artifact.<artifact_key>`.
+- these inputs are hydrated by `prepare`, not `analyze`.
+- if analyze fails due to missing canonical previous cache, rerun:
+  - `narratio run-stage --session-id <id> --force prepare`
+
 ## Remote archive layout and publish contract
 
 When archive is enabled and run upload is enabled, archive publishes under: