The session variant that Phase 1 L1 users actually hit (intake creates
adhoc sessions when no flow_id is provided). Single-pane note-taking
surface with 300ms-debounced autosave to walk_notes. Shares header
shape + Resolve/Escalate modals with the tree variant. Splits the
notes textarea by paragraph and persists each as a structured
AdhocNote entry. Stops saving once status leaves 'active'.
L1WalkPage now dispatches both variants.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>