47d05ba946
Phase F2 of the Career Workspace roadmap: CvVariant, CvVersion, and TailoredApplication -- the reference seam. Per the product boundary, a job application REFERENCES a tailored output; it does not own it. CvVariant is not job-owned: it survives job deletion (SetNull on its optional CareerProfile link, not cascaded), can be reused across applications, and carries its own append-only CvVersion history. TailoredApplication is the join that links a variant to a job (cascades with either side, since the link is meaningless without both). Rather than shipping empty tables with no consumer, this dual-writes from both existing TailoredCvDraft save paths (SaveTailoredCvDraft, UpsertGeneratedTailoredCvDraftAsync via GenerateTailoredCvDraft) -- same pattern as CareerProfile in Phase F1. TailoredCvDraft remains authoritative for every existing read path; the sync is additive and never blocks or fails a draft save. 2 new tests: variant/version/link created on first save, same variant reused (not duplicated) with version incrementing on subsequent saves. Verified against the real dev DB -- FK dependency ordering (CareerProfiles -> CvVariants -> CvVersions/TailoredApplications) holds in both SQLite and MySQL reconciler dialects.