Tasks

• [x] Specify scope and verify current metadata endpoints and booking routes.
• [x] Add deterministic availability and metadata regression tests.
• [x] Implement provider models, availability scanning, and metadata ingestion.
• [x] Seed and register the provider and support contextual booking links.
• [x] Verify overlapping upstream IDs remain isolated in search.
• [x] Verify migration upgrade/downgrade and project quality gates.
• [x] Update provider documentation and the global checklist.
• [x] Audit the complete ingestion-to-notification path; fix application-error handling, search visibility, stale records, atomic refreshes, retry-transport cleanup, and populated-catalog rollback protection.
• [x] Document remaining shared-worker gaps with concrete examples.