WRNexusJS v0.6.0 R5 store type regression fix

R4 accidentally restored an older @wrnexus/store type surface while changing the syntax package import boundary.

Corrected

Shared, client, and server store state now use separate generic types.
StoreCombinedState<S, CS, SS> is used by computed values, actions, persistence, and lifecycle hooks.
Store action inference defaults to callable StoreFunction values instead of never.
createClientState and createServerState no longer have to overlap with shared state.
The internal initialization promise is named whenReady, allowing application state to use ready safely.
Generated browser stores also expose whenReady rather than reserving ready.
validate:0.6 now guards all of these signatures to prevent regression.

packages/store/test/store.test.ts passes strict TypeScript checking with a local bun:test type shim.
Runtime probe passes client/server action selection, computed values, client-only state, server-state serialization exclusion, and a boolean state field named ready.
VS Code tests: 28 passed.
VS Code validation: all checks passed.
Repository v0.6 validator: 14 passed, 0 failed; only the expected local Bun availability warning remains in the packaging environment.