feat(ui): adopt persona visibility directives on mounted shells [SPRINT-016]

Apply stellaAuditorOnly and stellaOperatorOnly structural directives on
evidence-audit, promotions, and evidence-export surfaces with ViewModeToggle
surfaced for persona switching.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/features/checked/web/persona-visibility-directive-adoption.md

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+# Persona Visibility Directive Adoption
+
+Sprint: SPRINT_20260308_016_FE_orphan_persona_visibility_directives
+Tasks: FE-OPV-001 through FE-OPV-004
+
+## Summary
+
+Adopted the dormant `*stellaAuditorOnly` and `*stellaOperatorOnly` structural directives
+on six mounted evidence, release, and promotion shells. The `ViewModeToggleComponent`
+is surfaced on each adopted shell so operators and auditors can switch persona mode.
+
+## Adopted Consumers
+
+| Consumer | Persona Section | Directive |
+|---|---|---|
+| `evidence-audit-overview.component.ts` | Audit Events Today stat | `*stellaAuditorOnly` |
+| `evidence-audit-overview.component.ts` | Proof Chains stat | `*stellaAuditorOnly` |
+| `evidence-audit-overview.component.ts` | Pending Exports stat | `*stellaOperatorOnly` |
+| `release-detail.component.ts` | Decisioning/Promote/Deploy buttons | `*stellaOperatorOnly` |
+| `release-detail.component.ts` | Proof Chain and Replay section | `*stellaAuditorOnly` |
+| `promotion-detail.component.ts` | Decision box (approve/reject) | `*stellaOperatorOnly` |
+| `promotion-detail.component.ts` | Evidence tab content | `*stellaAuditorOnly` |
+| `promotion-detail.component.ts` | Replay tab content | `*stellaAuditorOnly` |
+| `provenance-visualization.component.ts` | Node detail rows | `*stellaAuditorOnly` |
+| `provenance-visualization.component.ts` | Raw Data button | `*stellaAuditorOnly` |
+| `evidence-bundles.component.ts` | Checksum (SHA-256) detail | `*stellaAuditorOnly` |
+| `export-center.component.ts` | Profile action buttons (Run/Edit/Delete) | `*stellaOperatorOnly` |
+
+## ViewModeToggle Placement
+
+| Consumer | Placement |
+|---|---|
+| Evidence Audit Overview | Header row, right of title |
+| Release Detail | Actions bar, inline with buttons |
+| Promotion Detail | Header row, right of status badge |
+| Provenance Visualization | Header row, right of title |
+| Evidence Bundles | Header row, right of title |
+| Export Center | Header row, right of title and quick actions |
+
+## Tests
+
+- `evidence-audit-overview.component.spec.ts`: 5 focused tests covering mode switching,
+  conditional stat visibility, and deterministic toggle behavior.
+
+## Constraints
+
+- Findings and policy consumers are excluded (reserved for other sprints).
+- All consumers are mounted shells (no dead route trees).
+- Persona distinction is operationally meaningful in every case.