Adds two fixtures captured from a running Portal (daily and weekly) and
tests that parse them with the Kiosk API client and evaluate them with the
schedule engine, including adjacency and Sunday->Monday spillover. Proves
the Kiosk consumes actual Portal output with no hand-editing.
Add docs/schedule-api-contract.md (current state, time semantics, schedule
data model, validation rules, endpoints, sync behavior, System Name rules,
dynamic audio, backward compatibility, per-phase touchpoints, open items,
changelog) and docs/fixtures/*.json (daily, weekly, none, midnight-crossing,
adjacent, dynamic-audio, and legacy v2 payloads). Kept byte-identical with
the portal repo.
NeilClack