test: add fast-check property hardening - #68
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Summary
Add supplemental fast-check property-based hardening for the TypeScript core.
Why
Exercise broad grammar, normalization, state-transition, persistence, and atomicity spaces without replacing Python-authored conformance fixtures.
Scope checklist
npm test)Notes
Added
fast-checkas a development dependency and six bounded properties. The policy identity and invalid-import generators now explore broader structured input spaces. No runtime implementation changes were made. This PR does not modify synced fixtures or provenance, so fixture drift is not applicable.Validation details:
npm test: passed (263/263)npm run build: passednpm audit: 0 vulnerabilities