feat: require complete data context header evidence (AEG-V16-018)
Make projection and watermark visible requirements, expose stale state accessibly, and add component regression coverage. Status remains IN_PROGRESS pending predecessor and UX evidence.
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# AEG-V16-018 — DataContextHeader
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## Scope
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- **WBS / Requirement / UI / Test:** AEG-V16-018 / REQ-V16-FEC-02 / UI-V16-FEC-02 / T-V16-FEC-02
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- **Classification:** one shared FE component slice; no server, API, schema, policy, or provider change.
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## Source / Assumption / Unknown / Decision Required
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- **Source:** `docs/CURRENT/CATALOGS/WBS_MASTER.csv`, `frontend/src/shared/contracts/versionSet.ts`, `frontend/src/shared/ui/EvidenceVersionSet.vue`, and existing `KsDataContextHeader.vue`.
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- **Assumption:** consumers pass values from an approved server-side evidence/projection context; this display component neither creates nor validates an evidence decision.
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- **Unknown:** the WBS tracker lacks approved predecessor evidence for AEG-V16-017. This slice preserves that dependency as a completion blocker.
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- **Decision Required:** a UI/UX owner must approve visual and accessibility evidence before this item is marked COMPLETED at MVP-A.
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## Acceptance mapping
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| Acceptance requirement | Implementation evidence |
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| --- | --- |
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| as-of / VersionSet / Projection / Watermark | all four are required props and rendered in the header. |
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| stale state is visible and accessible | `data-stale`, visible `STALE`, and an assertive status label are rendered together. |
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| reproducible component behavior | `KsDataContextHeader.spec.ts` verifies evidence propagation and stale output. |
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## Execution evidence — 2026-08-08
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- `frontend: pnpm test -- --run src/shared/ui/components/tests/KsDataContextHeader.spec.ts`: 1 file / 2 tests passed.
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- `frontend: pnpm typecheck`: passed.
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- `frontend: pnpm build`: passed. The build reported a 501.13 kB gzip main chunk warning; no unapproved performance threshold is inferred from that warning.
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