Finish render rollout with markdown publish defaults, analyze guidance, and docs updates

docs/internal/README.md

@@ -20,9 +20,10 @@ Canonical stage order from `internal/stage.All()`:
 4. `polish`
 5. `normalize`
 6. `trim`
-7. `analyze`
-8. `publish`
-9. `notify` (placeholder)
+7. `render`
+8. `analyze`
+9. `publish`
+10. `notify` (placeholder)
 
 `notify` is currently a placeholder stage with optional notifier call behavior; it has no persisted pipeline outputs.
 
@@ -39,5 +40,6 @@ Canonical stage order from `internal/stage.All()`:
 - `stage-polish.md`
 - `stage-normalize.md`
 - `stage-trim.md`
+- `stage-render.md`
 - `stage-analyze.md`
 - `stage-publish.md`