Tracks execution of docs/plans/2026/09/22/101-one-client-store-and-transport (17 slices). Ships as major 21.0.0. PRs land in tier order: tier 0–3 seam (01–05) → realtime store/channels (06–10, 13) → cross-tab/offline/cli default (11, 12, 14) → guards/apps/docs (15–17) → release.
Tracks execution of docs/plans/2026/09/22/101-one-client-store-and-transport (17 slices). Ships as major 21.0.0. PRs land in tier order: tier 0–3 seam (01–05) → realtime store/channels (06–10, 13) → cross-tab/offline/cli default (11, 12, 14) → guards/apps/docs (15–17) → release.