feat(exportcenter): truthful web/job-admin/timeline-sink runtime cutover
Sprints SPRINT_20260416_014/015/016_ExportCenter_truthful_*_runtime.
- Infrastructure: PostgresExportArtifactRepository.
- WebService: unsupported-shims for export attestation, audit-bundle job
handler, exception report generator, incident manager, promotion
attestation assembler, risk-bundle job handler, simulation exporter,
timeline notification sink; runtime/verification scaffolding.
- Tests: AuditBundle program HTTP integration + runtime suites.
Consolidated because sprints _014 (web), _015 (job admin), _016
(timeline sink) share repo + Program.cs + runtime wiring; splitting
would produce non-buildable intermediate states.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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