Phase 7c + 7d: optimistic data updates and offline mutation queue
7c — Optimistic Data Updates:
- orchestration.sx: optimistic-cache-update/revert/confirm + submit-mutation
- pages.py: mount_action_endpoint at /sx/action/<name> for client mutations
- optimistic-demo.sx: live demo with todo list, pending/confirmed/reverted states
- helpers.py: demo data + add-demo-item action handler
7d — Offline Data Layer:
- orchestration.sx: connectivity tracking, offline-queue-mutation, offline-sync,
offline-aware-mutation (routes online→submit, offline→queue)
- offline-demo.sx: live demo with notes, connectivity indicator, sync timeline
- helpers.py: offline demo data
Also updates plans.sx: marks Phase 7 fully complete (all 6 sub-phases 7a-7f).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
giles
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