Avoid event scans in run activity snapshots

[yvette-carlisle]

Summary

• keep dashboard/run-activity project listing on registry/project-run scoped state refreshes
• load protocol summaries only for runs belonging to the requested project instead of scanning the whole protocol event journal
• cover project/run listing hot paths with persistent cache isolation tests

Verification

• cargo test -p decodex persistent_project --all-features
• cargo test -p decodex persistent_ --all-features
• cargo make check