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Amended by 0252 and 0256.

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Context

0054 chose Zustand for local client state and dropped the Figentra OS signals package. In the package questionnaire the owner reversed that: the signals package is ported as the client-state package, and the old TanStack Store state package is dropped. The Figentra OS sync package is a stub, and 0059 specifies an offline mutation queue without naming the package that owns it.

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Decision

  1. Server state lives in TanStack Query through @stackra/query, keyed from the generated API client. The package is cursor-first and has no router dependency.
  2. Local client state lives in @stackra/state, a port of the Figentra OS signals package. Zustand and TanStack Store are not used. Nothing server-owned is copied into @stackra/state.
  3. Optimistic updates live in @stackra/query.
  4. The offline mutation queue lives in @stackra/query. It owns 0059 decisions 2 and 3 (idempotency keys, 409 conflict records).
  5. The sync stub is deleted. No sync package exists, and the sync-engine row of 0011 stays Deferred.
  6. Packages that need reactive client state build on @stackra/state: @stackra/network, and the leader-election and lock parts of @stackra/coordinator.
  7. The same packages are used on web, desktop and mobile.

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Consequences

  • One reactive primitive across Stackra packages, maintained in-house rather than by a third party.
  • The signals port carries its own tests and docs, where Zustand would have come with an ecosystem.
  • Offline behaviour has one owner, @stackra/query, instead of a separate sync package.

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Enforcement

Planned: FORBIDDEN_DEPENDENCIES in tools/scripts/validate-repository.mjs gains zustand and @tanstack/store. Queue unit tests (replay, ordering, 409) in @stackra/query. Nothing checks this today.

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Supersedes and sources

Supersedes: 0054. Fills the owning package left open in 0059. Sources: owner decisions in chat, 2026-10-19 (Round 8 F8, F10a, F10b, R6, T1).