test: prove core shared and vue public contracts
Replace internal mocks with real-store integration coverage and fix defects exposed by public behavior regressions. Preserve mutation payloads, query ownership, form edits, hook contracts, and cache lifecycle behavior.
Upgrade workspace tests to Vitest 5 and Node 26, align source aliases and package scripts, and record contract coverage and fault checks.
Validation: 1065 scoped tests and 1702 workspace tests pass, alongside shuffled integration runs, build, types, lint, and coverage. Browser gate remains blocked by the pre-existing playground SSR null ce error.3 weeks ago0f29338