Persist audit, provenance, and signoff as exportable evidence bundles #13

Problem Statement

The public site emphasizes lab-facing prototype evidence. Studio currently keeps run output and audit trail lines in memory with a capped ring buffer. That is useful for the UI, but it is not enough for reviewable design evidence, reproducible experiment handoff, or lab/pre-hardware signoff.

Proposed Solution

Add an evidence bundle export:

• circuit document,
• runtime input JSON,
• run output JSON,
• trace metadata/checksum,
• foundry profile id/version/hash,
• KPI policy id/version,
• audit trail with actor/action/timestamp/before-after summary,
• bosonic signoff summary,
• environment/tool versions,
• optional PDF report.

Use a deterministic folder or archive layout and include a manifest checksum.

Acceptance Criteria

• Exporting an evidence bundle creates a self-contained review artifact.
• Audit entries are structured objects, not only display strings.
• Bundle replay command is printed and documented.
• Tests verify manifest contents and checksum stability for a seeded example.
• Sensitive material such as signing keys is never included.

Validation

bash scripts/swift-test.sh
swift run schrosim-cli run docs/examples/runtime_default_foundry.json --backend hybrid

Evidence

• core-swift/Sources/schrosim-studio/StudioStore.swift
• core-swift/Sources/schrosim-studio/CLIService.swift
• core-swift/Sources/schrosim-studio/CircuitReportPDFRenderer.swift
• docs/08-tracing-observability-reproducibility.md