Add observer quarantine clear command, expose quarantine status, and fix dependency restore/build validation

[Copilot]

Summary

Adds observer quarantine operations in the CLI, exposes quarantine state in observer listings, and addresses dependency/CI validation issues found during PR feedback.

Added

• Added chronicle observers clear-quarantine <OBSERVER_ID> with confirmation flow and clear success/error messaging.
• Added runtime-compatible invocation for ClearObserverQuarantine so supported Chronicle contracts are used when available, with a validation error when unsupported.
• Added specs for clear-quarantine invocation success and unsupported-contract fallback.
• Added list-observer coverage to verify isQuarantined is present in JSON output.

Changed

• Extended chronicle observers list output to include quarantine state:
  • JSON/compact JSON include isQuarantined.
  • table/plain output include a Quarantined column.
• Updated package reference casing for MongoDB in integration tests to use MongoDB.Driver.
• Updated Cli.Specs project warning configuration to avoid Release build failure from generated-source type conflicts (CS0436) in CI-equivalent builds.

Fixed

• Fixed missing operator action in CLI for clearing observer-level quarantine.
• Fixed observability gap where observers list did not explicitly indicate quarantine state.
• Fixed CI restore/build failure caused by duplicate central package version entries for MongoDB (NU1506).
• Verified CI-equivalent commands succeed: dotnet build --configuration Release and dotnet test --configuration Release.

Removed

• Removed duplicate central package version entry that caused restore/build failures.

Security

• No security-impacting behavior changes; security scan run as part of validation.

Deprecated

• None.

[einari]

@copilot update the Chronicle dependencies and verify that everything is working

[Copilot]

@copilot update the Chronicle dependencies and verify that everything is working

Updated and verified. Chronicle package versions are already at the latest available (15.26.1), and I fixed the package-version duplication that was breaking CI restore/build. I also aligned the MongoDB package reference casing and verified with CI-equivalent commands: dotnet build --configuration Release and dotnet test --configuration Release (both passing). Commit: be2bcad.